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one other thing in my 4.0 jeep straight six i run rotella i installed a fuel injected comp cams high performance camshaft in it and one of there tech guys said rotella has more zink in it which was better for something or the other cant remember exactly. he said i could run any brand but i would need to run a additive. my grandfathers freightliner has over 600000 miles on it all pulling log trailers around 70,000 lbs and it gets changed around every 10-15k i think. to bad they dont make a thinner viscosity, doubt my hyundai would like 15w40 very much
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