Originally posted by Lance Kinley:
Mine has lost over a qt every 4000 miles since it was in the 30K mile range... the correlation? The switch to Mobil 1. I went back to Castrol GTX in the 60K range to check, and sure enough, no oil loss. Once back to Mobil 1, I noticed it again.

I figure it was going through the PCV system. Should be less now that I have a separator/restriction in the system.

-Lance



And then, again, Lance, maybe the Castrol has volatilized, gotten a bit gunky, and replugged all the little leak-points where the synth -- because of its resistance to volatilization -- did not and should not.

Over the course of 4000 mi, my car loses about as much synth oil as yours did. But, because I prefer to keep my cars for a long time, I'd much rather trade-off minor oil loss for superior wear-reduction in the powertrain.

PS: Please cash my damn check. You're messing-up my accounting.