Cusser
+1y
Before I installed new pistons/rings and had the head re-done, my '88 was smoking enough that it needed work, but not like a cropduster like some of you say.
My compression was 165 in all four, but my plugs got dirty in a month or two, so I'd take them out and clean with a wire wheel on the end of a drill. 2.5 years later, I haven't yet had to clean the plugs.
In other words, your compression rings are fine, but your oil control ring is NOT doing its job, not expanding any longer to "scrape" the oil off the sides of the cylinder, so it's burning. That's very common with age and about 150K on these engines, and worse if they have been allowed to run hot, like bad radiator.
See my build thread at bottoms of my posts, has photos.