slant six help needed, burning oil

Check compression before deciding the engine is worn. Valve guide seals usually make smoke after idling a long time, like at red lights. When you take off, you get a puff of smoke from the oil sucked past the stems while you were sitting, then it clears up. If you get blue smoke under full throttle (but not after sitting, above), that is often bad rings.

I second the suggestion to check the PCV (cheap, maybe just change it). My 82 Aries was a horrendous mosquito fogger after sitting at a certain long red light (facing uphill), otherwise never smoked a bit. I finally found I had incorrectly installed the PCV snorkle (inside a plastic box on side of valve cover). I ASSumed, the snorkle should face down to keep oil out. I finally noticed a slot in the bottom of the elbow, figured "oil drain", must be supposed to face up (to get clean air from top of cover). Facing down, oil drops slung off the camshaft up into the snorkle tube. I finally found an article that explained what I stumbled on. I bet many of those 2.5L engines were discarded because "bad", when it was just the PCV snorkle.