Adding another:I used to think just like you. Blackstone changed my mind. See my thread below. 10,000 mile intervals are fine because the oil shows plenty of life left and the metals show the engine isnt harmed
http://forums.swedespeed.com/showth...sis-Results&highlight=Blackstone+oil+analysis
http://forums.swedespeed.com/showthread.php?220051-Impressive-V8-oil-analysis
The Cliff's Notes version is: 100K+ mile V8 with 8600 miles on the oil, Blackstone thought the oil was "recently changed", maybe a few thousand at most. HAH!