Pull the spark plugs and spray some fogging oil or WD40 in there.
Get it good and spray it around. Crank it over manually with a socket a couple of times with intermittent spraying if you can. That way you can make sure there is something all the way up and down in there. Fogging is better while the engine is cranking because you can get the head and valves too. But at least you'll have the cylinders down good.
