I found For Sale an M103 3.0 engine with 90,000mi for $900. I'm currently at 190,000mi with my 87' and going through a quart every 2,000. Is this a great opportunity to swap and -100,000?? What would be a fair install price?
Thanks!

 

I think you should save your money. I have been assured that oil consumption of a quart every 2,000 miles is normal consumption for these cars regardless of the mileage. It is highly likely that the engine with 90K miles will do the same.
Cheers, Jdub

 

I would run a leak down compression test on your current eng. That should give you a good ideal of the condition. I agree a quart of oil every 2000 isn't significant unless that is a present rate of consumption and has been increasing significanly over the past 20k or so. I would save your money.

 

These engines are famous for wearing out the valve guides causing excessive oil consumption. The bottom side is virtually bulletproof so a valve job should get you back in good shape. As a Mb tech, I'd consider 1 qt per oil change normal consumption for this engine.

 

Hi DESIGNWELL1,
If you concern about loosing the oil consumsion, perhaps you should do the valve job will cost cheaper than replacing the engine and will solve this problem.
Ryan,