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In the 7.3 l forum, oil brands was a big deal a few years ago. I don't recall it being a 6.0 issue, though. But, yes, different oils (and oil additives), can effect the way the engine behaves. Romping during cold weather and a certain brand of oil was pretty common. I have noticed that big of a deal, but I use either Shell Rotella, Chevron, or Mobil Delvac.
What weight oil did you use when you were using the Rotella? Maybe you went from 30 weight to 40 weight, and it's dragging on the engine more? just a thought.
short_stuff
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Y2K F250 CC PSD Auto, Short-bed Lariat, Woodland Green/Gold, ordered 07/10/99, born 09/12/99, delivered 10/08/99, Access bed cover, Bed Rug, Zoodad mod, Viper Remote Start Alarm, Fumoto valve, 103K somewhat error-free miles (so far) [never back to dealer for anything]
Repairs: CPS, Water Separator Valve assembly, rear axle bearings, VSS, batteries, brakes, alternator, serpentine belt (x2), driver door pwrlock actuator, water pump
2009 VW Tiguan 2.0 l turbo 200 hp gas engine (TDI engine not available for it yet)
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