I'm looking at doing my own oil and filter change on the 3 speed ZF auto box fitted to my 84 505 Sti Executive. I have usually had this done by Auto Tran. service people before but given I do almost all of the other servicing and repairs I can't see why not. Do I only need a Filter and Pan seal plus oil or is there something else I should know? After following the discussion on Dexron 11 and 111 oils lately I think I will also use the opportunity to fill it with Dexron 11. Appreciate any suggestions advice.