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Old July 5th  
shift denied!

Join Date: May 2011
Posts: 237
depending on type of car, motor, driving conditions, ect...most oils don't start fully breaking down til 4000-5000, not 3000 like most recommend...any performance mods also should be taken into nitez said, i too am not a fan of pennzoil...parafin based oil (quaker state too) can cause build up in the motor...seen this happen to a friend of mines straight six in his jeep cherokee...used pennzoil since it was new...6 years later we put a valve cover gasket it on...pulled off the valve cover and had almost a solid layer of build up...mobil 1 castrol royal purple or redline would be the way to go...
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