Originally Posted by 03CumminZ4X4

Just noticed that my engine oil is black as coal. I changed my oil over to synthetic Delvac at 30K miles prior to the TST box and now after running the TST for under 2K miles the oil goes from golden to black. I know that the Extra fuel from the TST will cause this but I am a little surprised that it got this black this quick! Have been running the TST on 2/3 - 3/3 and a few ahort runs on 5/5 playing. Wondering at what intervals you guys are changing your oil and what kind of oil your using running the TST. I just hate to change full synthetic oil out at 5k miles. If needed then I may just go back to regular Delvac due to the cost....Or remove the TST and run the truck stock.....NA! What fun would that be! Anybody else notice this?