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Oil Viscosity and Engine Performance
If the oil viscosity is too low, the engine experiences:
- Increased wear from metal-to-metal contact
- Increased oil consumption and leakage
- Increased engine noise.
Some oil suppliers might claim better fuel economy for the lower viscosity oils. Lower
viscosity results in lower oil film thickness. Therefore, Cummins Inc. has required that all multi-viscosity 30 weight (xW30) oils registered under CES 20078 (API CI-4) must meet the minimum High Temperature / High Shear viscosity of 3.5 cSt. These can be used over a wider temperature range than other 10W30 or 5W30 oils. As these oils will have directionally thinner oil films than 15W40 oils, top quality Fleetguard® filters must be used above 20°C [70°F]. See Figure 1 for viscosity recommendations.
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