I will admit, to using synthetic oil
, but only because I have gallons of 5W30 Mobil one on my shelf. I used this oil in my Vettes, and last year, PEP boys had a special. Purchase a MADD calender for $1.00, and it included a coupon for three quarts free, with purchase of three quarts. This brought down the price of Mobil one to $16.00 for six quarts.
Do you realize how many MADD calenders I gave away last year, missing one coupon?
I believe, I still have eight cases of Mobil 1.
The one thing I always do when doing an oil change, is to purchase the best filter, and this is for any car I have ever owned. The best filters out there for the H3 are probably the Mobil 1 filter or the K&N. They filter down to 10 microns (normal filters filter down to 15-20 microns), and if off-roading in sand, this might be important.
If anyone is ever curious to see how their oil stands up, send an oil sample to an oil analysis lab such as
http://www.blackstone-labs.com/ and have the oil analyzed. This will remove a lot of doubt on whether or not the GM oil life system really works. It sure proved to me that the system works great, and very accurately.