Suniso SL-32S

Suniso SL-32S is a fully synthetic polyolester (POE) refrigeration oil from the Suniso SL series — formulated with select polyolester base stocks and additives for excellent miscibility with HFC refrigerants in compressors for refrigerators, freezers, air conditioners, chillers, and industrial refrigeration systems. The VG 32 grade serves the scroll and small reciprocating compressor class that dominates commercial AC and refrigeration.

The Suniso name has set the standard in refrigeration lubrication since 1933; the SL series carries that pedigree into the HFC era with the low-temperature miscibility data (published per refrigerant, below) that lets an engineer verify oil return at design conditions rather than hope for it.

Which grade you need is set by the compressor, not by the refrigerant. Read the nameplate or the OEM service manual and match the ISO viscosity grade. In our stocked SL range: SL-32S (VG 32) for scroll and small reciprocating compressors — the great majority of R-410A air conditioning and R-134a commercial plant; SL-68S (VG 68) for larger reciprocating and screw duty, typically R-404A/R-507 cold rooms and packs; SL-220S (VG 220) for screw compressors and heavily loaded bearings. Other ISO grades in the SL series can be brought in to order.

POE and mineral oil are not interchangeable. If the compressor plate calls for Suniso 3GS, 4GS or 5GS, that is the mineral-oil family used on R-22 and R-12 plant — an SL-series POE is not a drop-in for it, and an HFC compressor will not survive on mineral oil. Converting a system between the two needs a proper flush and oil-change procedure, not a top-up. Tell us the refrigerant and the compressor model and we will confirm the correct grade before you buy.

Handle POE oil as a moisture-sensitive product. It absorbs water from the air far faster than mineral oil, and absorbed moisture becomes acid inside a running system. Keep containers sealed until the moment of charging, use an opened pack promptly, never decant into an open jug or leave a can standing on the bench overnight, and fit a fresh filter drier whenever oil is changed.

Order SL-32S when a scroll or small reciprocating compressor on R-410A, R-407C or R-134a needs an oil top-up or change, after a burnout clean-up, or as workshop stock for AC and commercial refrigeration service — it is the grade that fits the widest part of the installed base.