It's been in the ground for millions of years but breaks down in an unopened can??? Should there be an expiry date on oil?
Oil does not break down or lose it's lubricating ability. In an engine, it does get contaminated though. Even if the oil is from the 70's, it's still decent oil. I wouldn't hesitate to use it in a higher mileage vehicle, older tractor or in small engines or something along those lines. If I had a $60,000 new diesel pick up, I'd use newer oil recommended for the engine. There's thousands of tractors and equipment 40, 50, 60 years old that are still running strong that didn't have any of the newer grade oils in them. According to some, older oil can have better additives than new oil.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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