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

Using Pennzoil makes my car operate WAY better than not using oil!

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

Been using itfor years nothing works better, cost efficient great all around

I use 5w30 in my car have never had a problem...perfect

I run it in my work car 2008 Chevy hhr and it had 300k miles on it

I've used this oil for many years, it's the best oil on the market I must say

I used this a few months ago when I got my oil changed.

My Daddy would never use anything else. I've used it since I've been driving.

I have been using this oil since ive been driving and it has never did me wrong! Great product