Quote:
Originally Posted by JCL
Not trying to hijack your question, but it will depend on fuel composition as one of the variables, and fuel varies between North America and Europe. That is in addition to the supply agreements, ie which oil company has paid to have their name on the valve cover.
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Actually I was more interested in oil viscosity. The BMW NA dealership network uses the Castrol SLX Professional OE 5w-30 LL04 exclusively to my knowledge. I also know that Motul (France) offers a 5w-40 'Specific' LL04 that they recommend for the M57.
Traditionally, you could follow the temp-visc chart to come up with a recommendation based on ambient operating temperatures. But according to BMW, LL04 oils are exempt from this chart in the classic sense and have unlimited low and high ambient temperature usage guidelines.
I find it hard to believe that a 30wt oil is sufficiently thick to use in Texas in the middle of the summer, in a diesel engine to provide adequate lubrication.
I was just trying to see if BMW in other markets might use a 40 wt oil.