Gale - Back in the days of leaded gas the lead additive provided modest degree of lubrication to exhaust valves. It thus slowed valve seat wear a bit.
However I've never seen any evidence that running unleaded gas harms the old stuff. (Lots of anecdotal stories but never any hard evidence).
Further, my father in law continued farming 600 acres with his 5 gas tractors a dozen years or so after leaded gas was banned. Never had a valve problem with any of 'em. In fact all still are in "ready to work" condition - if one could afford to run 'em at today's prices for gasoline that is...
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My position: Don't bother with additives - they benefit only the people that make and sell the stuff. But if you feel you MUST spend the $$$ on gas additives, instead take that money and stick it in the bank. Then use it to pay for a valve job if/when one is actually ever needed.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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