Originally Posted by kam327
No but I wouldn't run any oil to 10k myself.
You could run Pennzoil yellow bottle to 10k, but it would have been spent when you changed it. Not worth the risk to me, as that lubricant wasn't formulated to run that long.
Saying that you would never run ANY lubricant that long means that you have no experience with superior formulations. The sample of Amsoil ATM 10W-30
below was used in a Lincoln Town Car 4.6L 2V engine for just over 10,000 miles (1 year interval).....and it was wasted when it was dumped. This oil had just as much, if not more life left in it than your sample of Pennzoil at only 5,000 miles. Calcium content is a big key to this. *TBN numbers are not linear to miles of use*
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