Just bought a 1990 Sportrack EL with 100K.
I've fixed a few small problems (Broken fuel pump, clogged fuel filter, etc) but still have one big problem...
It's using 1/2 litre of oil per tank of petrol with only a few minor leaks and no smoke and a perfectly clean air filter housing/carb.
I did find a large ball bearing (!) shoved down the front breather hose, which I removed. After adjusting the mixture and idle speed, she runs much better and pulls up hills in 5th!
That alone may solve the oil consumption, but I may need to replace some seals and gaskets.
I've read about rings and valve seals/guides, but with no smoke I can only hope it is the leaks, but with no puddles of oil?