does your oil look like a milk shake? or are you seeing it at the top of your dip stick or in the oil fill tube? if your oil in the pan does not look like a total milk shake and there is a little in the filler tube or on the upper part of dip stick. this can be caused by condensation.which can be caused by over filling the oil and the crank beating the oil causing the oil to foam. which will also cause the oil to appear in the air cleaner. this is a best case situation.
if the oil is totally milky compression check first the cyl leak down test. also could be leaking intake manifold gasket. check torque on intake bolts. you didn't say you were loosing coolant or not. good luck!
1976 Cherokee chief
1970 AMC rebel THE MACHINE
1965 mustang fastback
1972 international travelette
Yes I have a problem that’s why Iam here