Quote:
Originally Posted by glend
So your saying that the manufacturers recommended spec is irrelevant, or I'll advised, or what? Any oil produced to that manufacturers recommended technical specification, comply for service and warranty purposes.
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Not at all Glen. In fact quite the opposite. The right viscosity and blend as specified by the manufacturer is the most important thing. However the R and D testing that is done by the manufacturer is done with a specific oil and there is no way to know how other additives or friction modifiers in the oils may effect other components. Two prime examples I can think of of the top of my head are the valve stem seals in E90 series BMWs and the DPFs in a large range of modern European diesels. Inferior oils will lubricate the engine to the required specification but the degradation / heat dissipating properties / low Sulfur content may not be. These things effect the longevity of many modern car components. I would suggest that most of the major brands will be acceptable but not the lower quality " home brand " oils. Even if they have the right general certification.