My baby is ready for another oil change. This time I want to clean out the old sludge, carbon, etc. I know they make additives you just pour in the crankcase for a few minutes, then drain and put new filter and oil in.

Anybody know of a good product that does this? If so, how good does it work?

Thanks
Larry

Larry, I usually use kerosene. I put 1/2 to 1 quart in and drive it around for about 10 miles. Then I let it cool and drain WELL. This was an old mechanics trick and I never had a problem doing it. Used it in a lot of my older cars.

Chris,

Thanks for the imput. Just regular kerosene that you can buy at a hardware store? Will this work for all types of cars?

Thanks
Larry

There are lots of engine additive/detergent/etc products out there on the market, but the best way to get all the crud out of the crankcase is to drop the oil pan, clean it throughly, and put it back on (with a new gasket of course).

|QUOTE|Vettecor said: Chris,

Thanks for the imput. Just regular kerosene that you can buy at a hardware store? Will this work for all types of cars?

Thanks
Larry|/QUOTE|
Yes, that's what I used. I would also drop the pan if you can to scrape it clean, as previously mentioned.

GUNK makes a product I used a few times... Its probably more expensive than kerosene but it was easier for me to buy and use.
Depending on how much dirt in your engine, you may want to perform the routine I did.... Drain oil and refill with 4 quarts of new oil and 1 qt of GUNK. Run engine for about 10 minutes. Drain and do same thing, i.e. 4 qt new oil and 1 gt GUNK. Run engine 10 minutes and drain oil again. Refill with 5 qt new oil. This time I run the engine about 100 miles and drained the oil again. Refilled with 5 qts new oil. This may seem to be overkill but I was having problems with noisy valves and wanted an easy way to fix it. Last year I ran another qt of GUNK and fresh oil then drained. I was surprised to see how clean the oil was .