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 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

"Spraying" is the operative word in this sentence. Cover the exposed injector holes with a large towel before you spin the engine over!

275 PSI compression will expel the oil an impressive distance. The goop will then hit the underside of the bonnet and then run down the fenders and inner wells. If you still have the insulation under the hood you'll get to "enjoy" the odor of the oil every time the temperature warms up. Mmmm, mmm, mmm!

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now