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SAE 15W-40 grade oils
Viscosity is the first thing to settle when choosing an oil: load-carrying capacity, film thickness and cold-start behaviour all follow from it. This page covers the equipment that typically calls for SAE 15W-40 and lists the catalogue products in that grade.
Where this grade is used
- Engine Oils
SAE 15W-40 products in the catalogue
- Shell Rimula R4 L 15W-40 — High-speed diesel engine oil
- Shell Rimula R4 X 15W-40 — High-speed diesel engine oil
- Shell Rimula RT4 L 15W-40 — High-speed diesel engine oil
- Shell Rimula RT4X 15W-40 — High-speed diesel engine oil
- Shell Rotella T Triple Protection 15W-40 (CJ-4) — High-speed diesel engine oil
- Shell Rotella T4 Triple Protection 15W-40 (CJ-4) — High-speed diesel engine oil
Before changing grade
- Moving one grade up increases film thickness but makes cold pumpability harder.
- Moving one grade down reduces churning losses yet raises the risk of film breakdown under high load.
- The equipment builder's viscosity window should be the reference for any change.
- If the system is not fully drained, the resulting mixed viscosity has to be accounted for.
Price and availability
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