Sunoco Suniso 3GSD is a naphthenic mineral refrigeration oil from the GSD series of the Sunice (formerly Suniso) range, made by Japan Sun Oil Co., Ltd. The property figures on this page are the manufacturer’s published typical values for the grade. We supply the grade and quote the manufacturer’s data sheet with every offer, so the figure you compare against is the maker’s own, not a reseller’s rewrite of it. The 40 °C kinematic viscosity published for this grade is 29.5 cSt, which places the grade in ISO VG 32 under ISO 3448. The manufacturer also publishes the 100 °C viscosity (4.4 cSt), the density at 15 °C (0.910 g/cm3), the pour point (-40.0 °C) and the flash point (178 °C, Cleveland open cup). The oil is used with CFC and HCFC refrigerants, with ammonia and with the hydrocarbon refrigerants in refrigeration and air-conditioning compressors that specify a naphthenic mineral charge. This is the GSD grade, which carries enhanced antifoaming properties for systems where foaming at start-up is a problem.
The measured viscosity of 29.5 cSt at 40 °C sits inside the ISO 3448 band called ISO VG 32, so the grade is identified by that bandwidth as well as by its own product code.
We supply this grade from our own operation in Foshan, China, in bulk and in single packs, in the original manufacturer’s pack or in a China-made equivalent produced to the same specification. There is no fixed minimum order — it is confirmed per order, because a single can and a full container load are both workable and the figure moves with the pack size, the quantity and the destination. Delivery is on any Incoterms 2020 term — EXW, FOB, CFR, CIF, DDP and every other rule — and payment is on any commonly used method, including T/T, L/C and PayPal. Send the compressor model, the refrigerant and the oil type on the nameplate and we will confirm what we can supply before quoting.
Sunoco Suniso 3GSD is supplied on published terms: the specification, the price terms, the payment terms and the documents are the same for every buyer, and they can be quoted without a site visit. The minimum order is deliberately left open, because it is judged case by case: the grade, the quantity, the pack size, the shipping terms and the container load all move it, so a single can and a full container load are both workable and neither is treated as the normal case. Send us the quantity, the destination port and whether you want the original pack or the equivalent, and those three turn the table below into a firm quotation. We supply refrigeration and compressor oils from our own operation in Foshan, Guangdong, adjacent to Guangzhou Port, and we hold stock on the grades we list so that a firm lead time can be quoted rather than promised on behalf of a third party. This grade is supplied wholesale and in bulk — to distributors, HVACR service companies, compressor OEMs and private-label buyers — as well as in single packs and sample quantities.
| Item | Terms for Sunoco Suniso 3GSD |
|---|---|
| Minimum order quantity | Not a fixed figure — confirmed per order, because it is judged case by case: the grade, the pack size, the quantity, the shipping terms and the container load all move it, so a single can and a full container load are both workable |
| Payment terms | Any commonly used payment method — T/T, L/C, PayPal and every other option — confirmed with the order |
| Price terms | Any Incoterms 2020 term — EXW, FOB, CFR, CIF, DDP and every other rule — quoted against your destination port |
| Supply ability | 1,000 pieces per year, held from our operation in Foshan |
| Origin | This grade is offered in the original Japanese pack from the manufacturer as well as in a China-made equivalent produced to the same published specification. Both routes are supplied against the same data sheet, and the route is confirmed on the quotation so that there is no ambiguity about what is being shipped. |
| Supply options | Sunoco Suniso 3GSD in the original manufacturer’s pack, or in a China-made equivalent produced to the same published specification |
| Who buys this grade | Distributors and resellers who stock Sunoco Suniso refrigeration oil, HVACR and refrigeration service companies, compressor OEMs filling new equipment, and buyers who need a documented equivalent of the grade. Wholesale and bulk orders are the norm; trial and sample quantities are also supplied. |
| Grade confirmation | Send the compressor model, the refrigerant and the oil type on the nameplate. This grade is a naphthenic mineral lubricant for CFC, HCFC, ammonia and hydrocarbon systems with a published viscosity of 29.5 cSt at 40 °C (ISO VG 32), so the match is made on the lubricant family, the viscosity and the refrigerant together. |
| Viscosity | The manufacturer publishes 29.5 cSt at 40 °C and 4.4 cSt at 100 °C for this grade. Viscosity is the number that decides whether an oil holds a film at the bearing at running temperature, and the 40 °C figure is the one the ISO 3448 classification is built on. The 100 °C figure describes how much the oil thins as it heats up, which is what matters when the discharge temperature is high. |
| Low-temperature behaviour | Pour point -40.0 °C. It is the low-temperature end at which the oil still flows, and it is the first figure to check when a system runs a low evaporating temperature. |
| Flash point | Flash point 178 °C (Cleveland open cup). The flash point is reported under an open-cup method, and it is not the same number as a closed-cup figure would be. |
| Foaming at start-up | The GSD grades carry enhanced antifoaming properties, and that is the difference from the GS grades in the same range: where a compressor shows foaming at start-up, the GSD grade is the one specified for it. Both series share the same naphthenic base and the same viscosity steps, so the choice between them is made on the foaming behaviour rather than on the viscosity. |
| Base fluid | A naphthenic mineral refrigeration oil is a refined mineral lubricant built on naphthenic base stock, and it is the charge used with CFC and HCFC refrigerants, with ammonia (R-717) and with the hydrocarbon refrigerants such as isobutane (R-600a) and propane (R-290). It is a different chemistry from the synthetic families (POE, PAG and PVE) and is not freely interchangeable with them in a running system, so a top-up is made with the same lubricant family the compressor was charged with. |
| Documents issued with the order | Manufacturer’s data sheet, safety data sheet, and a certificate of analysis for the delivered batch |
| Handling and storage | Store sealed, away from direct sunlight, and keep the container closed between top-ups. A mineral oil should not be topped up with a synthetic family, and a container should be resealed after use so that moisture and dirt do not get in. A top-up is made with the same lubricant family the compressor was charged with, not with whatever is on the shelf. |
Supply ability is stated for this grade rather than for the whole range. It is not the annual capacity of any single plant.
The manufacturer publishes this data for the grade itself rather than for a compressor series, so the final word on fitness is the compressor maker’s own charge instruction.
A refrigeration lubricant is chosen for the job it does inside the circuit, not for a single headline number. The manufacturer’s published data for this grade, read together with how a naphthenic mineral oil behaves in a CFC, HCFC, ammonia or hydrocarbon system, points to a specific set of problems the oil is there to solve.
| System need | How Sunoco Suniso 3GSD meets it |
|---|---|
| Lubricity at the bearing | The manufacturer publishes a viscosity of 29.5 cSt at 40 °C (ISO VG 32) for this grade, which is what sets the film strength at the bearing under load and the speed of the compressor it is specified for. |
| Miscibility with the refrigerant | A mineral oil has to travel with the refrigerant around the circuit and return to the compressor. A naphthenic mineral refrigeration oil is a refined mineral lubricant built on naphthenic base stock, and it is the charge used with CFC and HCFC refrigerants, with ammonia (R-717) and with the hydrocarbon refrigerants such as isobutane (R-600a) and propane (R-290). It is a different chemistry from the synthetic families (POE, PAG and PVE) and is not freely interchangeable with them in a running system, so a top-up is made with the same lubricant family the compressor was charged with. |
| Foaming at start-up | This is the GSD grade, so it carries enhanced antifoaming properties. Where a compressor foams at start-up the oil is carried out of the sump with the gas and the bearing can run short, which is the problem the GSD series is specified to solve. The GS grades in the same range share the base stock and the viscosity steps but carry the standard antifoaming level. |
| Low-temperature flow | The pour point published for this grade is -40.0 °C. On a low-temperature circuit it is the figure that decides how cold the system can run before the oil becomes the limiting factor, and it is read together with the viscosity to judge the return of oil to the compressor. |
| Thermal stability | The flash point is published as 178 °C under the Cleveland open cup method, and the 100 °C viscosity (4.4 cSt) shows how far the oil has thinned at running temperature. A naphthenic base is chosen for its solvency and its cold-flow behaviour in the systems that specify a mineral charge. |
| Correct family after a service fill | Because mineral and synthetic oils are different chemistries, the practical benefit of specifying this exact grade is that a top-up or a re-charge is made with the same lubricant family and the same viscosity band the compressor was built around. |
| Sourcing the right grade | The GSD range spans three grades from 29.5 cSt to 96.5 cSt at 40 °C, so a buyer can match the compressor’s requirement across the range from one operation rather than mixing brands. |
Read as a whole, the data answers the questions that actually come up at a service desk: which lubricant family, which viscosity range, how cold it can run and how stable it is when hot. The property figures on this page are the manufacturer’s published typical values for the grade. We supply the grade and quote the manufacturer’s data sheet with every offer, so the figure you compare against is the maker’s own, not a reseller’s rewrite of it.
A refrigeration oil order goes wrong for a small number of predictable reasons, and each step below removes one of them. None of the steps needs a site visit; all of them can be answered from the compressor nameplate and the invoice.
If the nameplate is missing or unreadable, send a photograph of the compressor and the system details and we will work from that.
The table below reproduces the property data the manufacturer publishes for this grade. The property figures on this page are the manufacturer’s published typical values for the grade. We supply the grade and quote the manufacturer’s data sheet with every offer, so the figure you compare against is the maker’s own, not a reseller’s rewrite of it.
| Property | Sunoco Suniso 3GSD | Method / note |
|---|---|---|
| Base fluid | Naphthenic mineral refrigeration oil | Manufacturer’s designation |
| Kinematic viscosity at 40 °C | 29.5 cSt | ASTM D445 |
| Kinematic viscosity at 100 °C | 4.4 cSt | ASTM D445 |
| ISO viscosity grade | ISO VG 32 | ISO 3448 |
| Density at 15 °C | 0.910 g/cm3 | ASTM D4052 |
| Pour point | -40.0 °C | ASTM D97 |
| Flash point | 178 °C | ASTM D92 (Cleveland open cup) |
| Refrigerant | CFC and HCFC — R-11, R-12, R-22 and R-502 — plus ammonia (R-717) and the hydrocarbons R-600a and R-290 | Application |
| Compressor types | reciprocating and rotary compressors in domestic, commercial and industrial refrigeration service | Application |
The values are the manufacturer’s published typical figures for this grade. Where a value is not published for a grade we say so rather than fill the gap.
The grades tabulated here are all naphthenic mineral refrigeration oils from the same GSD series, and they differ mainly by viscosity. The figures are the manufacturer’s published data for each grade, so the row can be read across without leaving the page.
| Grade | Viscosity at 40 °C | ISO VG | Pour point | Flash point |
|---|---|---|---|---|
| Sunoco Suniso 3GSD | 29.5 cSt | ISO VG 32 | -40.0 °C | 178 °C |
| Sunoco Suniso 4GSD | 54.5 cSt | Between bands | -35.0 °C | 182 °C |
| Sunoco Suniso 5GSD | 96.5 cSt | ISO VG 100 | -25.0 °C | 188 °C |
★ This page is for 3GSD. The other grades are shown so that the viscosity, the pour point and the flash point can be compared directly; each is quoted from the manufacturer’s published data for that grade.
The GSD series covers a spread of viscosities for CFC, HCFC, ammonia and hydrocarbon refrigeration compressors that run a mineral charge. The three grades tabulated on this page are the ones we supply, from the lightest to the heaviest, and this grade is marked in the right-hand column.
The ISO VG column is the band the published 40 °C viscosity falls in.
Buyers arrive at this page either from the product code on a container or from the compressor they need to fill. This table maps both routes to the same answer.
| Name or reference | What it is | Notes |
|---|---|---|
| 3GSD | Manufacturer’s grade code | The short code this grade is ordered under |
| ISO VG 32 | ISO 3448 reference | The band the published 40 °C viscosity falls in |
| Mineral oil / naphthenic | Lubricant family | The charge used on CFC, HCFC, ammonia and hydrocarbon systems |
| POE | Lubricant family | Polyol ester — a synthetic family used with HFC refrigerants, not freely interchangeable with a mineral oil in a running system |
| PAG / PVE | Lubricant families | Other synthetic families, not freely interchangeable with a mineral oil in a running system |
| GS (same range) | Other series in the range | Same base stock and viscosity steps, standard antifoaming instead of enhanced |
| Sunoco Suniso 4GSD | Other grade in this series | the next heavier grade in the same GSD series |
| Sunoco Suniso 5GSD | Other grade in this series | the heaviest grade in the same GSD series |
The grade codes and family names here are the standard Sunoco Suniso and lubricant-family names used across the industry.
The manufacturer publishes 29.5 cSt at 40 °C for this grade, which falls inside the ISO 3448 band called ISO VG 32. That is why the grade is presented with its class number: the number is not a marketing label, it is the band the published measurement lands in.
The property figures on this page are the manufacturer’s published typical values for the grade. We supply the grade and quote the manufacturer’s data sheet with every offer, so the figure you compare against is the maker’s own, not a reseller’s rewrite of it.
A naphthenic mineral refrigeration oil is a refined mineral lubricant built on naphthenic base stock, and it is the charge used with CFC and HCFC refrigerants, with ammonia (R-717) and with the hydrocarbon refrigerants such as isobutane (R-600a) and propane (R-290). It is a different chemistry from the synthetic families (POE, PAG and PVE) and is not freely interchangeable with them in a running system, so a top-up is made with the same lubricant family the compressor was charged with.
A mineral oil is the right charge on those systems, and a synthetic is the right charge on an HFC system. Mixing the two families in one circuit is not a routine top-up; it is a deliberate conversion, and the compressor maker’s charge instruction decides whether it is allowed at all.
The GSD grades carry enhanced antifoaming properties, and that is the difference from the GS grades in the same range: where a compressor shows foaming at start-up, the GSD grade is the one specified for it. Both series share the same naphthenic base and the same viscosity steps, so the choice between them is made on the foaming behaviour rather than on the viscosity.
On a low-temperature circuit the pour point is the figure that decides how far down the system can go before the oil stops moving and stops returning to the compressor. The manufacturer publishes it here at -40.0 °C.
Read together with the 40 °C viscosity and the 100 °C viscosity, the pour point tells a service engineer whether the grade behaves at the cold end as well as the warm end. It is the first figure to check whenever the evaporating temperature is low.
The flash point is published for this grade at 178 °C under the Cleveland open cup method. It is an indicator of how the oil behaves at the hot end, where a high discharge temperature is a real operating condition rather than a fault.
Viscosity is the number that decides whether an oil holds a film at the bearing at running temperature, and the 40 °C figure is the one the ISO 3448 classification is built on. The 100 °C figure describes how much the oil thins as it heats up, which is what matters when the discharge temperature is high.
The GSD grades carry enhanced antifoaming properties, and that is the difference from the GS grades in the same range: where a compressor shows foaming at start-up, the GSD grade is the one specified for it. Both series share the same naphthenic base and the same viscosity steps, so the choice between them is made on the foaming behaviour rather than on the viscosity.
Foaming is not a cosmetic issue on a refrigeration compressor. When the oil foams in the sump it is carried out with the suction gas, the level in the sump drops, and the bearing can run with less oil than it was designed for. An antifoaming additive package is the fix, and the GSD grades are the variant of this oil that carries it.
This is a third-party brand page, so the figures on this page are the manufacturer’s published typical values for the grade rather than our own measurements. We supply the grade and quote the maker’s data sheet with every offer, so the figure you compare against is the maker’s own.
The final word on fitness remains the compressor maker’s own charge instruction, because the compressor, the refrigerant and the duty cycle decide whether a given grade is right for a given unit. Where a system was charged with a specific branded grade, the safe course is to match that grade or its documented equivalent rather than to substitute a different family. We supply refrigeration and compressor oils from our own operation in Foshan, Guangdong, adjacent to Guangzhou Port, and we hold stock on the grades we list so that a firm lead time can be quoted rather than promised on behalf of a third party.
A: The manufacturer publishes 29.5 cSt at 40 °C and 4.4 cSt at 100 °C for this grade. The 40 °C value places the grade in ISO VG 32.
A: It is a naphthenic mineral refrigeration oil. Naphthenic mineral oil is the lubricant family used with CFC and HCFC refrigerants, with ammonia and with hydrocarbon refrigerants. It is a different chemistry from the synthetic families (POE, PAG and PVE) and is not freely interchangeable with them in a running system.
A: This grade is a naphthenic mineral lubricant for refrigeration and air-conditioning compressors running CFC and HCFC refrigerants such as R-12, R-22 and R-502, and for ammonia (R-717) and the hydrocarbon refrigerants R-600a and R-290. If your system runs an HFC refrigerant such as R-134a or R-410A, the correct family is a polyol ester, and you should confirm the lubricant family on the compressor nameplate before ordering.
A: The GSD grades carry enhanced antifoaming properties. They share the naphthenic base stock and the viscosity steps of the GS grades in the same range, so the two series differ on the antifoaming package rather than on the viscosity, and the GSD grade is the one specified where a compressor foams at start-up.
A: The manufacturer publishes a pour point of -40.0 °C for this grade. It is the low-temperature end at which the oil still flows, and it is the first figure to check when a system runs a low evaporating temperature, because below it the oil can stop moving and stop returning to the compressor.
A: The published flash point is 178 °C, measured by the Cleveland open cup method. Because it is an open-cup figure it should not be compared directly with a closed-cup flash point, which is typically lower for the same oil.
A: No — not as a matter of routine. Mineral and synthetic oils (POE, PAG and PVE) are different chemistries, and a top-up is made with the same lubricant family the compressor was charged with. If a system has to change family, that is a deliberate conversion with the oil flushed and the compressor maker’s instruction followed, not a top-up.
A: Both. The grade is offered in the original manufacturer’s pack as well as in a China-made equivalent produced to the same published specification, and the route is confirmed on the quotation so there is no ambiguity about what is being shipped.
A: No fixed figure. The minimum is confirmed per order, because it moves with the grade, the quantity, the pack size and the destination. A single can and a full container load are both workable.
A: The manufacturer’s data sheet and the safety data sheet come with the quotation, and a certificate of analysis for the delivered batch comes with the shipment.
A: Price is quoted on any Incoterms 2020 term — EXW, FOB, CFR, CIF, DDP and every other rule — against your destination port. Payment is on any commonly used method, including T/T, L/C and PayPal. Both are confirmed on the order rather than fixed in advance.
Every figure on this page is the manufacturer’s published property data for this grade. This is the set of sources and what each one establishes.
| Source | What it establishes |
|---|---|
| Sunice (formerly Suniso) GS/GSD series Product Information Sheet — Japan Sun Oil Company, Ltd. (copy hosted by jsunoil-sh.com.cn) | The manufacturer’s published typical properties for every grade in the GS and GSD series. This is the source of the figures on this page. |
| ISO 3448:1992 — Industrial liquid lubricants — ISO viscosity classification | The band system used to classify the grade. The published 40 °C viscosity for 3GSD is 29.5 cSt, which places it in ISO VG 32. |
| Sunoco Suniso 4GSD | The neighbouring grade in the same GSD series, for buyers comparing one viscosity against the next. |
| QISHANR refrigeration lubricants — product range | Our own refrigeration lubricant range, including the synthetic and small-pack products, so a mixed order can be assembled from one operation. |
This is a third-party brand page: the figures are the manufacturer’s published typical values for the grade, quoted as the reference set and confirmed with every quotation. The manufacturer’s own copy of the data sheet is the authority where a figure is revised.
This oil is manufactured and supplied by Guangzhou Qishanr Technologies Co., Ltd., trading as the brand QISHANR. The company is based in Foshan, Guangdong, adjacent to Guangzhou Port, and has been producing lubricants for more than 10 years from its own blending plant. That plant runs at an annual capacity of 6,000 tonnes, which is what allows us to hold stock on the grades we list and quote firm lead times rather than promising on behalf of a third party.
Refrigeration oils are the core of the business, but they are not the whole plant. The same lines produce general industrial lubricants, so a mixed enquiry that covers both refrigeration oils and ordinary industrial grades can be quoted, packed and shipped together instead of being split across suppliers.
This is not the full range. Specialised ester base oils and lubricant additives are produced in-house as well, which is the reason the synthetic ester grades can be specified to a target rather than bought off a shelf. If the grade you need is not listed above, send the specification or the product you are replacing and we will confirm whether we produce it.
Long-term partners get pricing that reflects a stable manufacturing base rather than a trading margin, and the same technical contact stays with the account from grade selection through to repeat orders.
Send the compressor model, the refrigerant and the oil type on the nameplate, together with the quantity and the destination port. We will confirm the grade, the documents and the terms before quoting, and there is no fixed minimum order to work around.
Request a QuoteOriginal publication. The product data, specifications and compatibility charts published on this page for Sunoco Suniso 3GSD refrigeration oil were originally published by QishanrLubricants on 2026-08-05 at qishanrlubricants.com. © 2026 QishanrLubricants. All rights reserved.
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