Lead had the effect of acting as a slight lubricate that did not burn well so it "flowed" through the system and provided a fine coating on the valves and valve seats. This fine coating actually worked to slightly extend the life and reduce wear. However the benifits of unleaded fuel now used, include reduced carbon which also helps reduce wear.
Bottom line is the aftermarket additives are usually a total waste of money and a sham.
You might run an ocasional carburator cleaner every 5 years or diesel injector cleaner every 5 years or so. More important is to run a hd grade of motoroil and change it every 500 hours.
New gas is bad about turning to varnish sooner so running the fuel through the system often is very important for gas engines. Then, some country's military have diesel fuel on storage that is over 10 years old that can still be used if treated for alge growth and water accumulation. I have heard of 40 year old diesel fuel in military reserves in russia thats still viable.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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