Group IV (4) base oil (synthetics) are chemically made from uniform molecules with no paraffin and generally don't need Viscosity Additives. However, in recent years Group III (3) based oils have been labeled "synthetic" through a legal loophole. These are petroleum based Group II (2) oils that have had the sulfur refined out making them more pure and longer lasting. Group III (3) "synthetic" motor oils must employ Viscosity Additives being petroleum based. As more and more large oil companies switched their "synthetic" motor oils to the less expensive/more profitable Group III (3) base stocks and of the large oil companies, only Mobil 1 Extended Performance, is still a PAO based true synthetic

Bought Ford Escape 4cyl and Chevy Silverado 6.2 liter V8 new in 2012. Mobil One Extended Life used in both since day purchased. Presently Chevy 148,012 miles and Ford 141,310 miles. NO leaks, No use of oil between 6,000 mile oil changes, No problems of any kind. I am retired now and expect to get 200K to 300K from these two thanks to Mobil One and simple maintenance. I always use Mobil One filters at every oil change. C. Linton

Purchased it brand new & is now just a work car....I drive 100 miles a day round trip and have used Mobil 1 Extended Performance 5W-30 since the Toyota was at the 14K mile mark....Well the odometer now reads 290,000 miles and it does not leak a single drop whatsoever & has never had any component replaced nor cracked open for a bypass... I use it in my other two vehicles & will never use anything else.....Best motor oil in the world

I had been running Mobil 1 High Mileage 5W30 oil in my truck, and when I had the oil last changed in Feb 2015, the greeter accidentally selected Mobil 1 Extended Performance 5W30. I didn't find out until I picked up my truck. I teased him about the mistake, but wasn't one bit concerned about it. Turns out, up in North Dakota, we still had a few weeks of some real cold weather, and I noticed that my engine with the Extended Performance oil seemed to start easier, and run smoother over the Mobil 1 High Mileage 5W30 I had been running. It had a slight tick on cold weather startup that would stop after 30 seconds or so, but it is almost non-existent now, or only lasts 10 seconds, then stops. I had already considered switching since I don't get a lot of miles on the truck per year and had been concerned about a 1 year oil change with the Mobil 1 HM oil. A Mobil customer service associate reassured me that even the HM oil was ok to use for 1 year between oil changes and I might lose the additional protection of the High Mileage additives if I switched to EP oil. I'll just keep a close watch on the engine and see if any leaks or noticeable burning start happening. Otherwise, I feel the accidental switch was a good mistake.

I have over 304,000 miles on this van. I bought the van in 2008 and do the oil changes myself. This oil is so good that I go OVER 20,000 miles on it Every oil change!! I have the oil tested to show how well it is holding up. The people who do the testing said I can go 23,000 miles next time!! I'll take it to 22,000 miles and have it tested and there after I'm going to change it every 20,000 miles. I would like to keep the van until I have 500,000 miles on it. Oh, and by the way, the van does NOT use any oil between oil changes!! After the last oil change, the TBN was 1.9 after 21,177 miles! So I know it will do the 22,000 miles no problem! WOW!! Like I said, best oil for 2008 sienna van!!!

I've used Molibe 1 in my engine ever since I bought it. I just passed 427,000 miles and it still runs fantastic. This is my work vehical. I do not baby it, but don't abuse it. I trust it completely even with the miles on it. It has never been rebuilt or opened up for internal egine problems. I only trust Mobile 1 to keep it doing exactly what it's doing! As far as I'm concerned, there is no other motor oil, all 4 of my daughters, all my friends, and anyone who asks me, all get the same answer, put Mobile 1 in your engine, and never worry about your engine again. I will let you know how things are going after half a million.

My last vehicle was a 2000 Ford F-150 with the 5.4 engine . From the first oil change a I always used Mobil one , it had 256.000 miles on her and was still running strong , when I traded her for new F -150 . I will continue to use the best synthetic oil available Mobil one . Thanks for such a great product .

I own 4 different vehicles of all different types new, old, performance and even an old 1993 Honda Del Sol. I always follow Mobil 1 Oil website recommended viscosity for these vehicles and none of them has given me any issue whatsoever. This will continue to be the only oil that I put in my cars.

What can I say…… I’ve been using Mobil synthetic oil for over 40 Years (!) and have had nothing but success with it. This new Extended Performance version allows me to go up to 20,000 miles or One year on a single oil change (Follow your manufacturers recommended oil change schedule listed in the owners manual). Imagine only having to have your oil changed once a year instead of the normal 3 or 4 times a year! Not only will you like the convenience of a yearly oil change, you’ll probably like what it does for your engine. This oil will not only save you money on gas because of the synthetic properties, but it will also clean up any left over sludge and varnish from the previous oil changes. It’s a win-win! Don’t over think this. It’s a no brained. Go out and pick some up today. What have you got to lose!

I just changed my valve cover gaskets on my Nissan Titan 185,320 I have used Mobil1 for the last 13 years if you could see the photos under the vale covers o sludge o build up it's amazing still shiny . You can't go wrong . I have owned this truck since new the motor is in perfect condition and so clean inside.