i have been running pennzoil in my mercruiser engine for years and never a problem.

Always used it,never no problems,keeps my vehicles running!!

Change oil every three thousand miles with usi g it

I prefer Penn Zoil over all other brands in any engine I own !!!

Pennzoil has been a trusted brand in my family and will continue to be for years to come.

Been using Penn oil for 30 years...no problems with it.

Only oil I use! The best oil, 914922 miles and counting!

Only motor oil I will use in my car. Best brand out there

Keeps my mustang running great and keeps all the power under control

I got it 3 months ago and loved it told all my friends and family to start using it