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Old 03-19-2013, 08:26 AM   #55 (permalink)
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Originally Posted by redpoint5 View Post
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.
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.

Would the octane or high loads account for increased piston or crank bearing wear?
High load - esp. lugging - will wear down the crank bearings.
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