Originally Posted By: HTSS_TR
Why more and more car manufactures are having their own oil spec's ? Used to be only few European manufactures have their own oil spec's, and now Detroit big-3 each has their own spec's, API spec isn't good enough ?
Of all Japanese manufactures only Honda has an oil spec for turbo engine in RDX, that I know of. May be other oil spec's for high performance car such as Lexus LFA ?
Many drivers don't even know the recommended oil grade for their vehicles, now they need to read the fine print on the back to find spec XXXX for their engines.
No, in many instances the basic API approval isn't good enough, particularly in applications that are hard on oil. The Honda VCM engines are an example of that, so are the Toyota sludgers. Engines that were supposed to be fine on the basic API stuff but obviously weren't.
Also, Nissan has their own spec for the GT-R (Mobil 1 0w-40).
The API has been behind the times forever. That's why the big diesel manufacturers came up with their own specs. That's why ACEA exists! Doug Hillary has posted extensively on it in the past.