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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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