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.
My old carbed FE powered Ford pickup has always had dirty oil at 2,000 miles (Even after I rebuilt it in 1990; it was even balanced with new valves) while my service van with a fuel injected engine still looks faily clean at 3,000 miles.
Friend bought a new Escort back in '89 and changed oil at 7,500 miles.
before it his 90,000 it was being rebuilt.
It sludged up the engine and the wear was so bad they had to bore it 040 over because it would not clean up at 030
Id think with todays oils it would have survived.
Also, modern engines have much tighter clearances; I could not imagine running 5W-20 in my '72 390 Ford. Get a micrometer/dial bore gage out on a 2011 car and compare it to a 1971 right off the assembly line
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If we had a balance scale, with engines damaged by not enough oil changing on one side, and perfectly good oil thrown out by excessive changing on the other, what would it look like?