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I have always changed my own oil at 3000 miles or less. I sold a 1976 Chevy PU with original engine and transmission with 280,000 miles on it a couple of years ago. Ran perfect, no smoke and didn't burn oil. I used this truck for hauling my race car all around the southern US and daily city driving (454 engine & turbo 400 trans). I now have a 95 Chevy with 100,238 miles on it. Runs perfect, only thing ever replaced was the alternator. Change oil every 3000 miles. My old 85 Cavalier had 188,012 miles on it when I sold it, never a problem out of that car...every 3000 miles.
My race car, Vega Panelwagon, 406 ci smallblock. Change oil every other race, new rings and bearings every year..never mind, that one doesn't count.
I worked for a Chevy dealership for ten years, since around 1978 when all the emmisions requirements came out the thermostat temps were bumped up from around 160-180 degree operating temp to 195. Most cars now have electric fans that do not even come on unless the engine reaches between 200-220 degrees. This increase in engine temp makes for a much cleaner burning engine, but also makes for a much hotter running engine meaning oils biggest foe, heat, is even more at work than before. Especially if you have an automatic transmission, turbo charger or both. I'd rather be safe than sorry...have you priced and engine recently, you could do a hell of alot of oil changes for that price.
just my 2 cents...BTW this only applies to natural engine oil, synthetics last much longer before breaking down.
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I never said you had to.
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