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Applications Precluded by Higher Viscosity
 
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Question:
Applications Precluded by Higher Viscosity
Hello, as a High Performance shop owner and engine builder, can you give me details on the application(s) where anything higher than your 0 (Zero) weight motor oil would be less desirable over a higher viscosity oil?
-- Carl of C.I. Performance, Thousand Oaks, CA
Answer:
It is important that oil provide an oil film thick enough to keep microscopic metallurgical imperfection in two moving parts separated to prevent welding wear. As engine manufacturers continue to produce parts with higher quality finishes, lower film thicknesses are required. There are also other hydraulic designs within an engine that could require different engine oil viscosities. Generally, a lower viscosity oil that still provides the minimum oil thickness requirement and protection will provide better efficiency in terms of fuel economy and engine power.
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