ya new oil is even better, you don't gotta mess with it at all. I've done that before, picked up a couple cases real cheap from G.I. Joes. I was putting them in the tank in the parking lot and i got some real funny looks.
Oh ya, and the lighter weight of oil the better. If it's 10 or 20 weight oil i'll run my truck on it straight. 30 or higher i usually mix w/ 5 or 10% diesel
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'94,2500 4X4, 5 sp, everything but... the stock turbo, still my anchor. peelout