Though I haven't experienced it myself, I recall hearing that coolant entering the burn chamber can squeeze past the piston rings (small amounts of vapor), which can start to mix with the oil vapor in the crank case. This can be detected by inspecting the upper end of the dipstick for a tan, pasty residue/film that will form well-above the oil level (near to top of the dipstick, below the rubber seal). It might be useless trivia. But it's easy to check...

1997 Sportage 4x4, auto-trans, Warn manual hubs, 4" UPYOURKIA front lift, TJ 106AA rear springs, 2-5/8" body lift, 31x10.50 treads, SmittyBilt SRC front and XRC rear bumper, swing-out tire mount, OBX LSD front diff, Track Finder rear locker, 5.38 R&Ps and... really crappy gas mileage! <img src="/forums/images/graemlins/shiner.gif" alt="" />