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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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