Just got our 2003 Chevy Trailblazer back. We got the oil changed in preparation for our trip to South Carolina in 2 weeks....also needed rear brake pads. As usual, I pulled the dipstick to make sure all was good. The oil on the dipstick looks real clear....almost reminds me of Valvoline.
We were going to get the transmission fluid changed, but the mechanic recommended we wait until 50,000 miles in accordance with the manual....said the GM ATF is real good stuff in these vehicles. It currently has 39,000 miles on it....80% highway miles.
FTR, GM recommends 50,000 miles for severe driving and fleet use (Police, Taxi, Delivery) or mostly city driving. They recommend 100,000 for mostly highway driving but we will stick with the more conservative recommendation.
Wolfs Head I have not heard of it for years. My old man used to buy it by the case when I was a Kid he slapped on Hundreds of Thousands of miles on his trucks.. His theory was oil is oil just change it.