Fabio and Terry,
For almost 3 years now since I've owned my 575, every once in a while, my F1 transmission misses a shift and goes into neutral when unshifting at speed. This has been particularly irritating to me when I am at the track. Last year I had my clutch life checked and it still shows 46% wear, so I have decent clutch life left. I was at the local Ferrari dealer this weekend and discussed with the service manager about changing the F1 transmission fluid and transaxle fluid to improve this situation, which has been recommended on this forum, and he did his best try to convince me that its not a good idea to open and change either the F1 fluid or the transaxle fluid. So now I am not sure what to do?
i tell what my dealer (and I) think, and Terry can tell his thinking ...
1 - change the F1 fluid is a good thing for the life of the system, replace time advised is 3 year.
About chang F1 fluid there are two way:
A) disconnect all pipes and remove all fluid, but after that is necessary to do the F1 system bleed only by means of SD2 tester
B) change only the oil that is in the oil reservoir, is not necessary any bleed ... in this case is better reduce time form 3 to two years ... This is the way advised by my dealer and i agree with this way.
2- also Transaxle oil is better to change at the advised time, that i not remember .... and is important use an oil with correct specifications, not important the brand ..
This oil is not cause the fault shift to neutral but increase the life, and the working of the synchronizers.
And the self locking differential early growing old the oil ..
My dealer tell me that for correcting of the "fault shift to neutral" there is a procedure with the SD2 tester that do all the shifts in order to make a new sets points in the system becasue is possible that due to the normal wear the forks and inside levers have changed a little bit their engagement points ... Like same that is in the clutch.