I agree with the other guys. I suspect that the sludge is

due to a combination of cold cycles and long/no oil

change intervals.You can buy "Engine Flush" and add

a quart to your oil, run it for about 5 minutes before draining

the oil and changing and it may get a lot more loose.

Then put the best/highest detergent oil you can get in.

Change it again after it gets dark. (The reason it gets dark

is that it cleans the engine and keeps the dirt suspended.)

If you have slime on the outside, get a can or two of gunk

and go to the nearest do-it-yourself carwash. Spray the engine

down with the gunk, concentrating on the slimiest places,

then wash with their strongest detergent and follow with

the water rinse. You might want to put a bag over your

distributor to facilitate starting.

"I just washed my engine and can't do a THING with it!"

After you clean the engine you can find out where the oil

is coming from. Around the fuel pump, left front (if you

have one there) is also a problem area.