I thought if you use normal oil you are supposed to change the oil every 3,000 miles and if you use synthetic blend then change it every 5,000 miles . I have never let a car go for more than 5000 miles without changing the oil. It sounds like you guys are letting them go about 10,000 or so miles. I am pretty sure that that is bad for your engine. Oil breaks down and loses its quality in 3,000 miles and synthetic gets more but if any other foreign matter makes its way in there, driving 10-15 thousand miles will really harm the engine. I will be changing my synthetic blend every 5,000 miles. Someone correct me if i am wrong so i can quit spending so much money on oil.
92' 626 ES
88' Mazda Truck
92' VW passaat (sold)
93' BMW 325is
86' BMW 318is
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