I used 10-30 w.in All Vehicles that I've Owned. I Had a Jeep Cherokee with a 4 liter inline6 cylinder in it and Put 335.000 miles on it before it got in a Crash in a IceStorm.A Freind Bought the Motor and Put it in His Jeep .He has put over100.000 more miles on it and last check she is still going. And We Have Been Rough on it at Times. Bottom Line Best Oil I've Ever Used.

[This review was collected as part of a promotion.] Dad used in in every vehicle he ever owned and so have I beginning with my new VW Beetle in '74. And we never had an engine problem with any of them. I have driven more than one vehicle most than 175k having never needed more than routine maintenance.

[This review was collected as part of a promotion.] I have always used Pennzoil Conventional oil in my vehicles. I have also NEVER had any issues. All of them were high mileage, one was 275,000 before I wrecked it. My current car has over 100,000 and is running great!

[This review was collected as part of a promotion.] My father only uses pennzoil and it is all I have ever used. My truck Has 200,000 miles and the engine still runs like new. The truck maybe rusting and falling apart but my engine still has its power and punch.

[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.

[This review was collected as part of a promotion.] I've had a Chevt truck with a leak on it and the oil pressure gauge went to ( 0 ) I had to drive it 5 miles like that I went slow not hard driving got jome and put oil in it (Pennzoil the only kind I use ) and drove it for an additional 2years . Tranny went out on it.

[This review was collected as part of a promotion.] I have always used Pennzoil in my cars. I have often seen other motor oils on sale for a cheaper price than what I pay for Pennzoil but I'll stick with Pennzoil because it may be cheaper but most likely the quality is cheaper too! Pennzoil is the best!

[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.

[This review was collected as part of a promotion.] Multiple cars and suvs over the years and I've always trusted Pennzoil. It's always kept them running smoothly until my next oil change. It's a tradition passed down from my father when changing the oil in all of his vehicles.

I have used conventional Pennzoil for years and currently have one vehicle with 260,000 + miles and one that pulls a 30 ft, 10,500 lbs 5th wheel with 155,000 miles on it. I have never had an oil related problem on ANY of my vehicles (current or past) with Pennzoil in use. When I had to do intake gaskets on the vehicle with 260+ on it because of a coolant leak, the lifter valley and inside the engine was crystal clean. Neither vehicle uses any oil between 3000 mile changes or has any sign of exhaust smoke. I will remain to be a loyal customer as long as you make a superb product.