What can I use to top off the reservoir instead of Shell Donax TA?
Scott- Synthetic automatic transmission fluid works just fine and the 599 even uses it in the F1 system. Here is a thread on the subject. http://www.ferrarichat.com/forum/showthread.php?t=236759&highlight=steering+fluid Taz Terry Phillips
Okay thanks. I did see that thread. Think it's okay to top off with the Valvoline? It will be mixed with whatever's in there.
