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Originally Posted by KevinH1990
His response has always been "follow the manufacurer's recommendation." Basically, if you change it too early or use synthetic when the manufacturer says non-synthertic is OK you are wasting money. His point is that the manufactures perform extensive testing on their engines and make their recommendations based on facts.
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Couldn't agree more! What motivation would a manufacturer have for suggesting a maintenance interval that's too long? They have a team of engineers who have years of training in this, and their goal is to get it RIGHT, not to come up with an arbitrary number to be debated by amateurs like us on a web forum.
Every car in my family (of which there have been many that have been around for a while) gets changes within 100 miles of the recommended interval, using the recommended oil (syn for the Boxster, non-syn for the Accord, for example), and I've never had a lubrication-related failure in any of my cars.