I was dead set against those synthetic oil blends for years, then I tore down a 7.3 with 350k on one
Back in '08 my buddy kept telling me to run Rotella T5 in my 7.3 instead of the straight 15w-40 I always used. I figured it was just a way to charge more for half the petroleum. Fast forward to last spring, I had to pull the heads on a truck that had been on T5 since 150k. The valvetrain looked almost new, no varnish, no crusty buildup. The guy who owned it ran it hard too, hauling hay bales out of Cheyenne every summer. I still run conventional in my old 4BT but I've been using the blend in everything else for about a year now. Any of you guys had a similar experience where you changed your mind on something?