Quote:
Originally Posted by Merk
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. |
I agree with Merk!! I remember the only negative going to unleaded was old engines needed harder valve seats.
Many people ran Amoco Ultimate before unleaded was popular. The exhaust system would last forever, an unusual situation in Pittsburgh!!