If the air filter is in good shape, the oil likely is clean from the outside, but there might be added wear debris as a result of the higher load. According to Shirley, this is the most severe engine test they have come up with. Suppose most of your driving is at reasonable ambient temperatures and conditions and at constant speeds, 50 or 60 miles per hour, for a few hours at a time.
Cool, clean and dryit's easy! Robert M Gresham Tribology & Lubrication Technology; May 2009; 65, 5; Docstoc pg. 18 Reproduced with permission of the copyrig
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