Quote:
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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I drove a chrysler 150,000 miles and my husband never changed the oil after the original run in, just the filter every 10,000 miles or so. It's still running. And as an aside, what exactly is the benefit of synthetic oil if you can't drive further without changing it. You might get an incremental improvement in your gas mileage, but I doubt it, certainly not enough to justify paying almost 50% more for synthetic oil over regular oil prices