As the title suggests, what weight gear lube are you pouring over your air lockers? I'm using synthetic 75/90, and I'm wondering if it's too light to keep the seal (in the locker, not one of the OE axle seals) in cooperative condition. I've had that oring replaced once, and I still find I need to roll for a few minutes to get it to stay locked, particularly fall-spring, although I'll also run into it cooler times of the day in summer. (Even with ~24 hr daylight, in July daybreak can get down to the 40s pretty easily, but then it can climb to 90 before the sun lowers itself a little.) Once the diff warms up, the compressor only cycles about every 30 minutes or more. Recommendations?