maxvla is right wit the oil. about power gains no. and a good oil is not about how well greases the engine so the friction coefficent will be less. a good oil should be able to withstand high temperatures without thermally breaking down. another important quality of the oil is the detergency (don't know if the term exists in english: the power to clean the engine). i will talk to one of my friends who worked for an engine oil company and post it up here.
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