Originally Posted By: crashtestdummy
Originally Posted By: gregoron
My opinion is that you can top off with different brands and weights, but better keep it in the same type (i.e. Conventional, blends, full synthetics). But as always, check your manual first.
I respectfully disagree.
Many manufacturers make blends.
What I meant was different types of oil use different additives and amounts of VI's (if any). It won't destroy an engine to mix different types, but you're not getting what you think you're getting in terms of performance.