Discussion Starter · #1 ·
I put straight 40wt. in the car, took a 500 mile trip, mostly xway, car ran like a clock but still knocking. Changed the oil to Rotella 15-40, plus added EOS from the Cadillac dealer. I replaced the EGR valve with the an original equipment one. Am preparing to take a 1500 mile trip through the mountains. Will keep my fingers crossed that all goes well. If I have a problem there's always U-HAUL.