That time I thought synthetic oil was a gimmick until a customer's 450,000-mile Cummins convinced me otherwise
I always ran conventional in my own rigs but a guy came in with a 2004 Ram with 450k on it, never rebuilt, and swore by Rotella T6, so I switched my F-350 over 50,000 miles ago and the oil analysis keeps coming back clean, who else here was dead set against synthetics and got proven wrong by real world results?