Very compelling post, Paul - thanks for sharing that. You live in a cool climate, and service and drive your car regularly, which has kept the acid levels down, and your chemicals "in suspension".
The only argument against changing it more often is the extra 80 bucks it costs...which for me, isn't a good enough reason. (no need to call Al Gore, Pep Boys loves my used oil). If it were any other engine, any other car, I might be inclined to extend it, but having had two engine failures in less than 80k miles I'm more than happy to spend the money and take the time to change it. Maybe not for everyone, but it works for me.
Last edited by Fred Demara; 08-19-2009 at 05:27 AM.
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