All of my diesels have always gotten oil changes every 3000-3500 miles with Valvoline Premium Blue 15/40 in the warm season and Valvoline Premium Blue Extreme Synthetic 5/40 in the cold season.
The SUPERCAR gets Valvoline 5/30 every 3000 miles.
The SuperCar is a 91 Oldmobile Calais with 230K miles. Hey, it was a freebie 5 years ago.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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