I am of the unyielding belief that if the fluids in a car are well maintained that the car will have the best chance for a long and healthy life ... in that regard, changing the oil at intervals of 3-5000 miles may be more frequent than is recommended, but it's relatively inexpensive insurance .... I don't get all **** about the 3000 mile thing, but will always get it done before hitting 5000 ... and, since I drive an average of about 8000 miles a year, I'm not exactly a frequent flier in the oil-change club ...