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Basically, the lead in the old fuel acted almost like a shock absorber, cushioning the valve as it sprung back into its seat. That being gone in our current fuel (current being, what, 1972 on in a lot of places?) the valves are now jush bashing their way closed instead. Over time, this wipes out the valve and seat. The tractor next door, a '68 Ford 2000, has this condition.... low compression from valves on all three cylinders. It is only a matter of time before this happens to any older engine... tractor or otherwise. Once this happens, the pounded valve seats need to be cut out and hardened ones pressed in. This pretty much solves the problem, but like so many other things in this world it isn't cheap! I can't see two stroke oil helping anything, as it isn't a lubrication issue, its an impact issue. Think about it, if someone was swinging a sledge hammer at your head, would you like to be lubed up so it could potentially slide off, or have something in between to absorb the blow? Personally, I have never used the lead substitute, mainly because my older equipment (cars included) see such limited run time per year. However, if you do use your engines a lot per year, and they are still in good condition, splurge a little on the proper lead additive instead.
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