Majordiezel
New member
I Am looking to do a SeaFoam treatment to my 2002 Gmc Envoy Xl, I'm gonna do the whole treatment as in putting it through the injectors, in the tank, and also in the crankcase. I have seen alot of YouTube vidoes about SeaFoam and in the videos they say not to go more than 100 miles without changing the oil. On the SeaFoam website they say that it is not required. Anyone else try the SeaFoam and did you or didnt you change the oil.