I hear of a lot of people carrying engine oil, gear oil, trans fluid, brake fluid, and the other fluids on the trail. It seems to me that if you were to break your oil pan or crack open a differential, then it would be very tough to seal either back up, and if you were able to, you’d need the full amount of fluid to drive again safely. But normally I hear of people only carrying about a quart or two of oil. So I’m curious to hear about how carrying fluids (besides water), has helped people on the trail.