Tried for first time about a year ago... Liked it so much use it on my wife's car as well!! Cars are running great! Highly recommend!!

[This review was collected as part of a promotion.] Use this in my Durango since it hit 70000 miles. 100000 miles later it still runs strong.

Got an ol chev Silverado wit close to 235,000 miles on it. I use Pennzoil high mileage EVERY TIME, and she aint let me down yet!

I use this brand and had hole in oil pan,drove my car for two days before I knew anything was wrong,kept motor alive!!

[This review was collected as part of a promotion.] I won't use any other oil in my F-250. Keeps the motor clean and quiet.

[This review was collected as part of a promotion.] great new, old,high mile ,less sludge and reduce leaks

[This review was collected as part of a promotion.] Bought this and I believe it made a big difference in performance.

Use this in my 89 Ford Crown Victoria LTD with 175,000 miles. Still good oil pressure less than pint low at 5,000 miles.

Take your favorite screwdriver and dip in any oil. Try to hold it by the tip. No prob you say. Now try with Penns hi mile. Slips away. Nuff said.

[This review was collected as part of a promotion.] Has kept my 1999 GMC Sierra running, just past 261000 miles