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There was no set amount of miles that an engine was junk (the 100,000 mentioned). It was a lot how it was maintained, short vs long trips, car or truck, how hard it was driven, etc. Many could make it 100,000. Many years ago I bought a 1950 3/4 ton Ford V8 (same engine as a 1948 model) with over 100,000 from the original owner and all it needed was a basic overhaul, rings, valves, bearings, etc. And that was a farm truck which would not have been used easy. There is nothing set in stone about how many miles you could get out of them.
Madmen is right, they all used oil to some extent, with maybe just a few exceptions. It wasnt all bad as it kept some fresh oil going into it.
Oil improvements has helped engines a lot.
Burning carbon out of an engine hasnt been needed for decades. But its fun to do! A good reason to drive fast.
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