Quote:
Originally Posted by redpoint5
I'll likely not go 14,000 miles since I change on a time schedule, and not on how long I believe the oil will go.
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I don't think you should go 14 K.
The TBN has been dropping like a stone with the increasing mileage.
It's the best indication of the oil's remaining usefulness.
Quote:
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Would the octane or high loads account for increased piston or crank bearing wear?
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High load - esp. lugging - will wear down the crank bearings.