I did notice the OLM percentage dropping rather quickly when in tow/haul mode. GMBoy is correct....these trucks are based on dino oil, and I am sure sleeping better at night using a synthetic. I will run a UOA on this oil this year. The truck now has 30,000 miles on it, and the reason I have not done a UOA yet was because I was doing shorter intervals due to break-in metals. I hear that these engines shed copper for a long time. I have ran PP 5w30 since the 3,000 mile mark. I hope this oil holds up, especially using the computer programmer.
Im ignoring the OLM during towing......
- Thread starter Ponch
- Start date
