First, LEAD is not legal to sell nor put in any product sold in the USA! Period. Secondly, these low compression engines don't take the abuse that the modern valves in engines do. Lastly, many 'snake oil' products are on the market. Marvel Mystery Oil is another. READ the ingredients. The older Ford and Ferguson engines do not need any additives, though my uncle swore by STP Oil Treatment, and running today's regular 87 octane unleaded fuel will not do any harm. Back when the octane was around 68/70.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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