Mobil 1 Extended is the best of the best! Used exclusively in a new 2000 Lexus RX 300 for 203,000 mi. Good MPG- 20 city, 26 hwy. Sewell Lexus inspected and stated "engine is like new!" Bought new 2008 RX 350 immediately drained and filled with Mobil 1 Extended and average 25 city and 32 hwy! Emailed dealer camera phone picture of computer display reporting 35.1 MPG at 70 mph w/AC, 2 occupants w/luggage from Austin, TX to Dallas, TX. Try it---bet you'll like it!

Awsome stuff I have been using it with a k&n oil filter seems to not degrade very fast last long and the engine runs smooth with better econemy.

I do think it is a reasonable oil, but not what I expected. I was more in preference of Castrol Syntec or Royal Purple, and I have personally had the best luck with AMSOIL. I seemed to burn more oil with Mobile 1 and I found it looking dirty very fast. I felt like there was other options that would perform better for less cost, at least in my truck.

I have used this oil with Xentx and I notice a more powerful engine, definitely.

I've been using Mobil 1 Extended performance for over 2 years now. I have a 2006 Chevy Malibu and a 1997 GMC Sonoma that I run it in. I also use the Mobile 1 performance oil filters. I run 15,000+ miles on the Chevy and about 5,000 miles on the GMC. The oil performs beautifully and looks clean coming out of the vehicles after 1 year of use. I live in Denver so we have the 4 extreme seasons here. Auto Barn ships quickly and I have had no problems with them.

This is the best motor oil I have ever used. It is worth every penny and then some. Don't waste your money on conventional or blended oils.