Quote:
Originally Posted by tm1100s
The manufacturer recommends an oil but the user believes his/her choice is better. Why?
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I do this on our Subaru, only because Subaru recommends 0w30 in other countries,
in our same temperature zone. Here (US), they recommend 0w20, allegedly to
squeeze as much MPG from a cold engine as possible.
An Airhead mechanic recommended to use 10w40 Rotella for a 500 mile break-ins on Airheads
but switch back to whatever you were using after that. Not sure the reasoning. That's
the only time I've heard of someone using that in a gasoline engine on purpose.
Supposedly it causes problems with catalytic convertors too.