I’ve run only Mobil 1 full synthetic for the last 15 years in cars ranging from an 03 Mercury Marauder to the current build on a modified 96 Volvo 850R. I usually run about 5000 miles between changes. The inside of my engines have no sludge build up and the oil looks like clear honey on the way out.

I have a 2001 GMC Yukon XL with 169,000 miles on it. It has been in the family it's entire life and has used only Mobil 1 Full Synthetic. It has never had any engine problems and the engine runs just as good as new. Never will use anything else other than Mobil 1.

i have used mobil 1 pure synthetic for almost 2 years now in my 2011 chevy hhr and have had no problems ,it has now 74,500 miles on it and doesnt use any oil i dont have to add any between oil changes . i would like to start using the high mileage but it is not dextos approved and after talking with a mobil rep i am going to the extended performance pure synthetic .

I have a 2012 Silverado 4.8 with a few mods in the engine tune long tube headers and a camaro ss body throttle I was recommended by the guy who tune the truck and this full advance synthetic oil is amazing the engine runs way smoother and I got 117250 miles on it it responds way better now than it use to not only that I change to the mobil 1 oil filter that too is a good product I will highly recommended and there no way I change the brand no more on the truck. Mobil 1 oil and there filters are the best.

Been using Mobil 1 for decades. Almost considered switching when Mobil 1 was changed from what a consumer thinks when he reads " true synthetic".....to what the government allows to be called a true synthetic. Have two Jeeps with checkered history's in regard to their engines....an '02 3.7 and an original 2012 Pentastar V6 engine ( before the head mods of newer Pentastars). The '02 3.7 supposedly has an unexceptably high rate of catastrophic engine failure because of too small oil channels...that when slightly gunked up...allows too little oil flow and the early Pentastar engines... which before valve guide hardening in newer versions... suffered from premature valve guide wear and failure as a result of heat and substandard lubrication. Hoping that the high detergent content and above average wear protection and reduction of oil breakdown...to make the difference. These engines will put Mobil 1 to the test

I have a 1999 Pontiac Trans Am WS6 with 114k miles. I just pulled the motor for some upgrades and I couldn't believe how clean the internals were. This is the first time this motor has been opened up. It's never been cleaned, flushed, etc. It has, however, never had anything but Mobil 1 Synthetic in it. After my experience so far, it'll never have anything else in it either.

The first 600,000 took me 3 motors. On my fourth I switched to Mobile 1 and have almost 400,000 on the engine in it now. Wish I had learned about Mobile 1 sooner. Who do I contact to see if anyone wants to do some publicity on my truck Pictures upon request

I've had my 1998 Ford F150 with a 4.6L SOHC V-8 since new. I run only Mobil 1 5w30. Drove it 266,000 miles until it blew a head gasket. Where we tore it apart - absolutely NO WEAR - ZERO. Clean inside and no wear. Cylinder walls still had a crosshatch pattern. Crank and cam journals were void of wear and we went back with standard sized bearings. I can provide images of this engine when it was torn down. Mobil 1 for life.....FOR LIFE. Engine is now rebuilt and ready to go back in my truck. Had I taken better care of my cooling system it would never have blown the head gasket. It would have gone way beyond 300,000 miles WITHOUT A REBUILD on Mobil 1.

I switched from conventional oil in my Toyota Sienna to Mobil 1 5/30 at roughly 70K. I now know that conventional oil can cause sludge build up. Sludge is not a friend of any motor. I change my oil every 5K and also install a new Mobil 1 filter. My oil comes out a dark golden color--not black like the dyno oil did. The van actually uses no oil in 5K. It now has 130,000 miles on it and runs like new.

I can't say enough good about the Mobile One synthetic oil. I started using it in my wife's 1990 Astro van and we drove it more than 250,000 miles on the original motor with no major repairs. Also, I bought a 1989 Astro van used with 89,000 miles on it and change it to Mobil one oil and drove the original motor over 365,000 miles. Presently drive a 2001 Astro van with over 400,000 mile, but its on its second engine, with 225,000 on the first engine, second engine with over 175,00 miles. I started using Mobil One because I drove over 3,000 miles a month and it was cost effective to use Mobile One and change the oil every 5,000 - 6,000 miles. I now use the extended oil and drive 15,000 miles to a oil change. I now have my whole family using Mobile One oil.