Hello All, This is a curiosity rather a problem. But, it baffles me none the less. The last year or so my '99 LHS has started to show some oil discoloration near the front of the plenum. All the lines going in are clean on the inside and my oil use has gone up a bit. And of course, so has the smoke but, still hard to see at speed. Still, nothing to complain about after 430,000 mile. Anybody have any ideas?