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A couple years ago I took my Honda to a Jiffy Lube and a few days later I noticed some leak spots on the garage. Took it to the dealer and they saw that the drain plug was stripped and plugged back in crooked.
A friend recommended that I get changes at a 76 service station, he seemed to have some rationale for them being better qualified. Regardless, I'm doing delar oil changes from here on. (Also I live in a condo and shared garage so I can't work on it).
As for the Porsche recommended 15k mi oil change - whats wrong with that? Doesn't the manufacturer know their cars? It seems to me that this is a design specification that the engineering team worked to. Also this is a closed system with a dry sump. Also we are using synthetic (non-decomposing) oil. It makes sense to me. I don't mean to be argumentative, I am just wondering whats the rationale for these frequent changes.
Maybe changing every 7500 mi would give peace of mind, but I wonder if anyone has an engineering argument for more frequent changes. In terms of saving money, too, you can spare an expense if you don't change unneccessarily often.
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