I used this Pennzoil 5w-20 (synthetic Blend) on my 2004 Lincoln Navigator 5.4 engine with 250k miles and it has helped to stop small leak around the seal on the bottom of the engine. I have been using this High mileage on the last 50k miles and I have no complaints. I change my oil every 3k-4k miles or twice a year due to the high mileage on the vehicle.

[This review was collected as part of a promotion.] My 1999 Jeep Cherokee 4x4 has 260,000 miles and continues to run great with this oil. I think since my husband changes the oil regularly that Pennzoil High Mileage Oil will keep it running indefinitely.

[This review was collected as part of a promotion.] I have used the high milage for many years and it just works great. I have used Pennzoil products in all of my cars and anything with an engine for as long as I can remember. I must have gotten that from my Father and Grandfather because they always had it sitting in the garage.

Pennzoil High Mileage is the real deal, I used it on my past vehicle and when I sold it the truck had 300K miles on it, I told the past owners what oil I used and they said they would continue to use it also, two years later I still see my truck around town and still running, I know it's because I used Pennzoil High Mileage and changed my oil every time it was due!!

Started using Pennzoil HiMi in my personal car and the difference was nearly instantaneous although Hemis are know to tick even when brand new this oil softened the tick and oil pressure ran much more in a range I liked. Being a mechanic and a auto repair shop owner that went from offering Valvoline to Pennzoil customers also notice the difference in their cars. Working on high end cars knowing their picky "oil choices" Pennzoil really works also if you own a Hemi V8 manufactured up to 2010 (example: 2000-2010) Do not use full synthetic ive seen plenty of Hemis come to an end early in life running synthetic I highly recommend Pennzoil Conventional and Conventional High Milage and all of Pennzoil motor oils

I run the high mileage formula in all my vehicles, since I have no idea what under 150,000 miles is like.. but I have never had a single oil related damage or issues, in the 8+ years i have been using it. and I must admit I occasionally go further than the recommended change mileage.

Best decision we ever made,switching to the high mileage oil,when you drive around alot.We have alot of doctor's appointments,with three kids of different ages,and a sick wife,and soccer,youth group,chorus,choir,charity events,snow crew ,overtime.We do alot of high driving.

I have been using this oil on an old rebuilt motor with approximately 140k miles. Ever since I blew my old one due to negligence, so I decided to start fresh with the type of oils I decide to put in my car. Pennzoil High Mileage for vehicles over 75k is just what I needed to maintain protection my "new" old engine. Even after 4-5k miles, I have yet to even burn 1 quart of oil due to its additives and seal conditioners.

I used this on my girlfriend's 02 Jeep Liberty on an oil change, and when I went to change the oil again (est. 4000 mi). Oil still looked good for another 750 mi. That made me switch from Quaker State to Pennzoil. And not to mention we are Penske fans! GO JOEY!

It arrived with the oil leak from two bottles and the whole box was oily. Leaked about 80 mg. Other than that, this was a good item for a good price.