Originally Posted by garyclegg
I have order the bigger pan, should be here next week. What can I do with the old oil
If I read correctly, your coach is new. Allison uses the Transynd TES-295 approved fluids in your transmission. You can't find anything better than what is in it! This stuff is expensive!
I would get all my catch pans immaculately clean, drain the pan install the new pan then return the fluid to the transmission. This pan holds about 1 qt more than the stock pan so you will have to add a qt. Harbor Freight and others sell a pump that fits into a standard 5 quart oil bottle. Get a long tube from Lowes etc. Clamp the tube outlet to the pump and pump away. It is difficult to get it in any other way.
While you are at it, change the external filter. Don't forget to move the magnet from the top of the old filter to the new one. It sort of looks like a gasket.
If you want new oil, Pep Boys recycles oil. There are other facilities that do as well.
This isn't difficult but be sure to keep EVERYTHING spotless. Don't introduce dirt into the transmission.