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Originally Posted by Brucelee
There is no need to debate anything here. You need to change oil consistent with how you feel about the issue, cost-benefit trade off etc.
From my point of view, it makes little or no sense to run any oil more than 7500 miles in an engine as expensive or fragile as a Box 6. That is simply my point of view, based on how I assess risk and reward.
If you are comfy running your oil beyond that, that is fine. Your money, your car.
It is all good.
I should point out that each car is different. We have seen UOA on BITOG that suggests that M1 is gone by 7500 miles. So, in those cases, it would not be wise to try to extend.
But, a few cases carries no statistical weight so, who knows. I wonder, would you run your car to 20K on any oil? I wouldn't.
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The ongoing discussion in which you challenged me to do an oil analysis, centered around engine wear. I drive mine hard, and the test you asked for says it is wearing less than average, which goes against your explanation of physics.
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
Last edited by Paul; 04-08-2008 at 03:19 PM.
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