Quote:
by ol'George
No lead gas causes the lack of lube to the stem.
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Interresting.......
Why does Kohler want the owner to use unleaded fuel?
Page 1.5 of a Kohler service manual states
Use only clean, fresh, unleaded gasoline with a octane rating of 87 or higher.
Unleaded gasoline is recomended as it leaves less combustion chamber deposits.
The lead in gasoline acts as a cushion between the valve and valve seat. Some engines needed the lead because they didn't have a harden valve or valve seat. Leaded gasoline will leave deposits in the combustion chamber and valve stem. The deposits is what causes the valve to stick....not the lack of lube.