[airstreamingypsy]

Originally Posted by Larchap49

Let me start by saying I was a technician for seven years and then a service manager at a large Chevrolet dealer for 20 years. Going 7500 miles between oil changes is a recipe for disaster and expensive repairs. If you replace your car every 2 to 3 years then go for it but if you plan to put 60,000 to 100,000 miles on it then 4000 miles is the max I would go between oil changes. Oil does not wear out it just gets dirty and the dirt and grit from internal combustion engines acts like sandpaper and wears the internals like timing chains, rings, and bearings. Over the years I've seen many large repair bills and replaced many engines due to penny pinching on oil changes. Oh and oil filters have bypass valves inside them so when they get to a certain contaminate level they stop filtering and pass the dirty oil by.
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People used to tell me I was crazy to change the oil on my 99 F-350 diesel, every 3,000 miles. I bet that truck is still running somewhere.