Without lead the soft valve seats of an old engine might wear down over 5000 hours. By then its time for a head rebuild anyhow, and with hardened seats put in the engine will be good to go for a long, long time. The cost of the additives over time will be more than the cost of the head rebuild; and the effectiveness of the additives is questionable anyhow.
Modern oils are leaving out the additive that helped the push rods float over the camshaft lobes? The EPA figures all gas engines by now have roller cams so no need for that additive. If one is worried about engine wear, this might be the type of additive to worry about. Its an oil issue, not a fuel issue.
Erhanol is a wonderful fuel system cleaner, so it will soften and clean out all the gunk and deposits you have in your tank, fuel line, carb. It will clog the heck out of things as it does so. Need to replace filters, clean carb. This is the fault of dirty fuel and gasoline over the years, the ethanol is actually doing a cleaning job. Ethanol also absorbs water. If your fuel is questionable, the exess water will become a problem and overload the ethanol, and create problems. Again, the ethanol is trying to help, but the fuel or your store age conditions are so bad its overwhelmed. Ethanol is hard on some older types of plastic/rubber, and it does not store for years and years - neither does gasoline, but anyhow one has to work with it a bit to make it work well. Basic maintainince issues.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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