Quote:
Originally Posted by JFP in PA
Maybe. Different oil manufacturer's often start with completely different blend stock bases, then use their own additive packages to put the oil into the weight characteristics they want. So blending two different brands of oil could easily take you just about anywhere viscosity wise.
You would be vastly better off not playing "mad chemist" and buying the correct oil. Either go for the Castrol 5W-40, or better yet the Joe Gibbs DT 40.
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+1 based on memories of a fuels and lubes class I had about 30 years ago.