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I pretty much grew up with Pennzoil products, and have been using PP for many years in everything I own....even lawnmower and yard tractor.... I am certain that other oils are super wonderful, but I am very satisfied with PP....had one truck go 230,000 miles on the stuff with no oil useage and...

It was underground for millions of years...can't imagine 5 years on a shelf can change it drastically....I would use it.

Just to clarify, it is a 2007 HD 2500 truck with 4.10 gears (for towing)and load range "E" tires. I bought a 2wd to save a little fuel as I really do not need 4wd. All fluids are full synthetic...engine oil, trans fluid (dexron vi) and gear oil. I drive with 55 pounds in th tires (rides rough)...

I think you guys have convinced me to stay with the 5w30...thanks for the feedback.

I found a GM APPROVED OIL LIST date June 2009 which list several 5w20 oild....here is the link: http://www.scribd.com/doc/21760008/Engine-Oil-Specifications-Approved-By-GM

I have been thinking about using 5w20 synthetic in my 07 Silverado with a 6.0L gas engine....trying to get better mpg than 9 in the city and 11 hiway unloaded.... Might a 0w30 be a better choice??? I am currently using 5w30 PP..... Any suggestions??

I just bought a really nice 93 LeSabre with over 100K miles on it...I want to change all the fluids and hoses, etc. After readiing this forum, I am really confused.... Some threads recommend Maxlife ATF, some Synthetic Dexron III and now Dexron VI.... I don't intend to fluch it, but rather...

I have a 2007 Chevy 6.0 3/4 ton truck...currently using Pennzoil dino, until the next change to PP. Anyway, the truck gets 14.5 mpg or so pretty consistently back and forth to work...except for the last tank of gas...drove into a BIG headwind for 25 miles just after filling up...took the...