I recommend you soak all cylinders with marvel mystery oil while you have the motor open.

Get a gallon and fill each a good bit.

Change the oil after you spin the motor over spraying out the remainder of oil.
This will clean up any open valve seats, and free up any gunked up rings.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!