On Feb 7, 11:08*am, jasmin wrote:
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???

I often throw a quart of ATF in about a week before the oil change.
ATF is very high detergent, and will knock a lot of dirt loose,& hold
it in suspension so when you do your oil change it gets flushed out.
When you change your oil catch it after a highway run, the drain plug
should be so hot you have a hard time handling it.
I've done the flush kerosene flush, i can't say it is all that
effective, & BTW diesel is pretty much oil and kerosene, so that works
too.