Quote:
Originally Posted by Mister Two
As long as you use the correct weight of oil (ie. 10W40), I dont see how changing brands would damage or affect your engine.
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+1 but theoretically you should not mix two different types of oil. i.e. if it has valvoine in it now you should either drain it all out and put castrol in or top it up with more valvoline.
Brendon