Recently purchased this 95 626 lx es, one owner, 114k , real niceshape, everything works, bla, bla, runs great. The trouble is that it uses about a quart of oil every 100 miles.Are these motors prone to bad valve seals or what. If you rev it up you will see a little whisp of blue smoke but just start it up and let it idle, nothing. Or is it rings. Pulled the plugs and they look fine a nice brown color.