The "Change Oil" message is calculated by mileage. It doesn't have anything to do with level.
For the transmission problem, first check for a leak and the fluid level. If that is okay, a transmission specialist will check for diagnostic fault codes first, but based on the mileage, the clutch plates may just be worn out and it's time for a rebuild.
Thursday, July 2nd, 2015 AT 7:35 PM