uhhh. ok?
It reminds me of the Cummins motor the local Dealer brought in to my machinist one day. 100 some odd thousand miles on it, oil had never been changed on it. EVER. I wish I would have taken some pictures of the sludge in that motor.
I'm still a little confused though.. Reciprocating engines will burn a little bit of oil, by design. According to my machinist, just by design, a little oil will be burned in a well built engine. If the rings are too tight in the cylinder bore, (and subsequently not burning oil) the motor wasn't built right. I can see his reasoning. I wouldn't be surpried if a 6.0 will burn through 15 quarts in 100K miles.
But hey, if two oil changes in 200K miles works for you... More power to you. I'm still wondering about how sheared the oil is.