Quote:
Originally Posted by Rusty Marina
Hold on there chief:
They used to say 7500 and 10000 miles even in the 1970s; but oil has got so much better and todays engines run much cleaner.
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When my dad bought a new Mercury Montego in 1968 Ford recommended 6000 mile change interval, but somewhere along the way Ford revised their recommended change interval to 5000 miles, because that's the recommended change interval in my '88, '94, '96, 97, and '02 Fords. My dad also purchased a new Mercury Grand Marquis in '99 which also has a 5000 mile recommended change interval.
I bought a new Buick Regal in 1977 and at that time GM recommended 7500 mile change interval.
I Use different change intervals on my cars, using 3000 mile interval when they are new and the engine is still breaking in and may have some metal shavings from break in, then usually go to 4000-5000 afterward. My '88 Escort Pony with 516,000 miles uses/leaks a quart about every 1000 miles, so I strain and use the oil I drain out of the better cars for topping off oil in it and give it an oil/filter change every 10,000 miles. I've cut filters open even after 10,000 miles and have never seen one that appeared to be clogged. I use conventional oil in all my cars.