Sunoco SUNISO 3GS Refrigeration Oil 4L is an ISO VG32 naphthenic mineral refrigeration compressor oil for service teams, maintenance workshops, and procurement buyers handling legacy and selected industrial refrigeration systems. The front package identifies the product as SUNISO 3GS (VG32), a mineral oil type used where the equipment documentation calls for naphthenic refrigeration oil rather than POE or PAG lubricant.
This page is written for purchasing and maintenance decisions, not as an OEM approval document. Qishanr supplies this product for HVAC/R and refrigeration MRO buyers who need a 4L service pack for controlled mineral-oil applications.
The values below are typical reference values collected from supplied product materials and public product data. They are not a batch certificate or guaranteed specification. For critical systems, request the current TDS, MSDS, or COA before use.
| Property | Typical / Reference Value | Reference Method |
|---|---|---|
| Product Brand / Line | Sunoco SUNISO 3GS | Product label / supplied data |
| Oil Type | Naphthenic mineral refrigeration oil | Product category |
| ISO Viscosity Grade | ISO VG32 | ISO viscosity grade reference |
| Kinematic Viscosity at 40°C | Approx. 30.5 cSt | ASTM D445 / equivalent |
| Kinematic Viscosity at 100°C | Approx. 4.2 cSt | ASTM D445 / equivalent |
| Viscosity Index | Approx. 40 | ASTM D2270 / equivalent |
| Density at 15°C | Approx. 0.895 g/ml | ASTM D1298 / ASTM D4052 |
| Flash Point, COC | Approx. 168°C | ASTM D92 / equivalent |
| Pour Point | Approx. -45°C | ASTM D97 / equivalent |
| Total Acid Number | Approx. 0.01 mg KOH/g | ASTM D974 / equivalent |
| Color | Approx. ASTM 0.5 | ASTM D1500 / equivalent |
| Floc Point with R12 | Approx. -55°C | ASHRAE / DIN reference |
| Aniline Point | Approx. 75°C | Reference property |
| Package Size | 4L can | Commercial packaging |
Use the oil only when the refrigeration system, compressor documentation, and existing lubricant type match mineral refrigeration oil requirements. Mineral oil behavior is different from POE and PAG oil in modern refrigerant systems.
| Refrigerant / System Type | Use Direction | Procurement Note |
|---|---|---|
| CFC systems such as R12 and R502 legacy equipment | Common mineral-oil application where the system calls for ISO VG32 naphthenic oil. | Confirm equipment condition and local service rules for legacy refrigerants. |
| HCFC systems such as R22 | Can be considered where the compressor requires mineral refrigeration oil. | Do not use as a shortcut for HFC retrofit work without a proper oil conversion process. |
| R717 ammonia systems | May fit selected ammonia systems that specify compatible mineral oil. | Confirm compressor model, seal compatibility, and plant maintenance procedure. |
| R600a and R290 hydrocarbon systems | Can be used only where the system design and service literature specify mineral oil. | Follow flammable refrigerant service requirements and local safety rules. |
| HFC/HFO systems such as R134a, R404A, R407C, R410A, R1234yf, R1234ze | Not recommended for most applications unless specifically confirmed. | Most HFC/HFO systems require POE, PAG, or other specified lubricants. Review the HFC refrigerant oil compatibility guide. |
The 4L can is practical when a buyer does not need a drum but wants more than a small top-up bottle. Typical purchasing situations include service vans, cold-storage maintenance rooms, and contractor workshop stock for older refrigeration assets.
These are composite procurement scenarios based on product type and common HVAC/R service decisions. They are not customer testimonials, field test results, or performance guarantees.
For buyers comparing viscosity grades in the same mineral-oil family, review Qishanr 3GS mineral refrigeration oil, Qishanr 4GS mineral refrigeration oil, and Qishanr 5GS mineral refrigeration oil. For oil-type selection, see the POE oil vs mineral oil guide.
| Product Name | Sunoco SUNISO 3GS Refrigeration Oil |
| Package | 4L can |
| Oil Type | Naphthenic mineral refrigeration compressor oil |
| Viscosity Grade | ISO VG32 |
| Recommended Buyer | HVAC/R service company, cold-storage maintenance team, supermarket refrigeration contractor, MRO buyer |
| Supply Support | Request current stock, lead time, and quotation |
Sunoco SUNISO 3GS is a naphthenic mineral refrigeration compressor oil. The 3GS grade is commonly associated with ISO VG32 mineral oil applications in legacy and selected industrial refrigeration systems.
SUNISO 3GS is an ISO VG32 refrigeration oil. Typical reference viscosity is around 30.5 cSt at 40°C and around 4.2 cSt at 100°C, depending on data source and batch documentation.
It can be considered for R22 systems where the compressor documentation calls for mineral refrigeration oil of the correct viscosity grade. Always confirm the compressor requirement and service history before use.
Not for most systems. Many HFC/HFO applications require POE, PAG, or another specified lubricant. Use SUNISO 3GS in HFC/HFO systems only when the OEM or a qualified technical source confirms mineral ISO VG32 oil is acceptable.
Do not mix oil types casually. Mineral oil, POE oil, and PAG oil have different miscibility and moisture behavior. Mixing should only follow a controlled service procedure or technical instruction.
Confirm the target compressor model, refrigerant, required oil type, viscosity grade, package size, quantity, and whether the system is legacy mineral oil service or a retrofit/modern HFC-HFO application.
