Back in the days before catalytic converters and unleaded fuel, there was a fair amount of engine repairing happening. I was there. Open up an engine that has been run for any length of time on leaded fuel, and you will see buildup of deposits. They will build up in the oil pan, any return passages in the block, the valley in a V-type engine, and every other little crack and crevice. Today, if you open up an engine, you will find it CLEAN!! As a matter of fact, I noticed this by the time unleaded gasoline became mainstream. There may be some carbonization of the oil, and in some cases some sludge, but nothing like in the old days.
Bottom line: lead is BAD for an engine. Period. Take it from one who has done major engine and transmission work all of his life.
Also note that Amoco has been selling unleaded gasoline for a very long time. Like back into the 1930s if I am not mistaken.
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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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