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International Automotive Technicians Network
Re: Break in oil for race engine
Posted to Castrol Forum on 4/4/2018

I would think to use what the engine builder says. Zinc additive can’t hurt, but with roller lifters should not be necessary. I have always run Castrol 50w race oil in my race only car 1400 hp. I prefer 20-50 in my street car 600 hp. Login to read more.