[This review was collected as part of a promotion.] I have a vehicle that went over 300,000 miles on conventional 10W40 Pennzoil before needing internal repair (not lubrication related). The crankshaft measured out at near perfect factory dimensions, and there was virtually no internal dirtiness. Saw similar results to this in several other engines at tear down after anywhere from 100,000 to over 400,000. No other oil has proven as reliable.

[This review was collected as part of a promotion.] I've been driving, boating and riding motorcycles all my life, I've done all my own maintenance and oil changes. I started changing the oil in my mothers car when I was 13. I'm now 59, and all these years it was Pennzoil that I used, still do, always will.

[This review was collected as part of a promotion.] My van has over 235,000 miles and this is the only oil I have ever used....however I just saw the bottle to the left of this one that says high milage....maybe time to switch oil....not the brand...the product....

[This review was collected as part of a promotion.] I've always used this motor in all my vehicles. Even though I've sold most iv kept on, that is my 1989 for f150 with the in line 6 cylinder engine. 340,000 miles later still runs perfect with no smoke. Nor any motor rebuild or swapping. Original piston, rings, block etc!

[This review was collected as part of a promotion.] The distinctive yellow bottle and logo of Pennzoil is a relief to use along with their dependability of quality....for even my older well traveled vehicle. Thanks - glug glug glug I don't worry what is going into my engine.

[This review was collected as part of a promotion.] My boyfriend is a mechanic for Trans Edge, a division of Mack Trucks. He actually does my oil changes and will only use Pennzoil! I highly trust his judgment and after an oil change my van runs GREAT!!

[This review was collected as part of a promotion.] I've been using Pennzoil since I got my first car at 16. I'm 67 now and still using it for all my oil changes. Always satisfied and engines are always clean . I have 165,000 on my GMC Denali and she's still running smooth.

I started using this product as soon as I found out you guys were going to sponsor my favorite nascar drive. Mr. Slice bread himself. Reba aka my sexy 2006 Dodge Charger has been purring like a kitten since I started putting pennzoil in her sexy v8 5.7 mouth.

My first time using it was when I was working on my auto servicing Merit Badge. This was my last Merit Badge that I had to earn. I have earned 65 Merits so you can trust me. I earned my rank of Eagle at the age of 13. I have been using this product ever since. Like the time I would do oil changes for my parents, neighbors and teachers. The life that you get out of this product is amazing.

[This review was collected as part of a promotion.] I used the 10W 30 in my auto with wonderful results. Sold the vehicle with 366 thousand and still running strong when I saw my old car years later with 422 thousand on it then. Change you're oil and good things happen.