it's an additive that has been attributed to turning a geo into a ferrari... really it's just a chemical additive that cleans junk from combustion chambers, etc. in cold temps, it's gonna be quite thick, so it's gonna have to sit for quite a while to be effective. available at wallyworld and most any auto parts store... not really a reliable repair tool, but perhaps in this case with such low compression, it's worth a try.
my guess is the WVO has gummed up the rings and letting compression blow by. maybe even try a can of diesel purge after the MMO and see if it can clean up anything.
but certainly do check the valve clearances first.
John

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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!