oil changes

3-4k mile oil change intetvals are the best preventative maintanance! I would never recomend 7k+ mile oil changes to anyone, regardless of what an oil analysis says! I've seen far to many engine problems related to extended oil changes or following what the manuf. recomends or what a programmed oil life monitor tells you! It's cheap insurance to change the oil and the life of the motor is extended far beyond what the manuf. expects out of one following there schedule. The manuf. likes to sell you a car that requires minimal to zero maint to make ownership look less costly. All they care about is getting the vehicle through the warranty period, after that any repairs are on the owner!