Years ago when our engine oil got very dirty, we would drain out the
dirty oil, then add two quarts of kerosene and 2 quarts of clean oil
and run the engine for 15 minutes. Then drain out the dirty mixture
and then add new fresh oil. The oil would then remain clean for the
longest time. I have one hydraulic valve that must be hanging up and
want to try this to see if I can free it up. The tappet is very noisey
when the engine is cold but then quiets when it warms up.
The engine is a V6 Buick Century. Anyone have recommendations or agree
with this old practice???