Buy a gallon, you won't use it all by t3 quarts isn't enough. As Bill said, make sure you're on flat ground and pump it in until if flows back out of the fill hole. The Bentley says GL4 and that is my personal preference however, it's pretty tough to find. -----Original Message----- From: tcb-bounce@xxxxxxxxxxxxx [mailto:tcb-bounce@xxxxxxxxxxxxx] On Behalf Of Julie Sent: Friday, January 21, 2011 2:36 PM To: tcb@xxxxxxxxxxxxx Subject: [tcb] Tranny oil If you change the tranny oil in a '71 Bus how much tranny oil will I need to refill it? I tend to go crazy and buy too much that I'll never get through, so if you have an idea of how much a tranny holds, please share your knowledge. Thanks, Julie