There’s a long thread on this and quite a debate. The short version is that the factory recommends GL-5 synthetic, but that tends to eat synchros. GL-4, such as Redline MT90, is more synchro friendly, but theoretically affords less protection to the gears. Sent from my iPad using FerrariChat
I've been running the MT-90 for a few years now. It's good but I do still get the cold 2nd gear crunch sometimes till it's warm. Might try the MTL next time. Definitely staying with GL-4.
I thought the general consensus was Valvoline Synthpower 75W-90. Looking at the back it actually has both GL4 and GL5 ratings depending on the parts.
I concur with this after much research earlier this year. I run Valvoline 75/90 Synthetic (VV975) specifically - note that mine is an F1, but I don't believe that makes a difference. I actually noticed a huge improvement in shifting (quieter/smoother) after putting this in.
It still matters as it’s the same internals. It’s just that you don’t feel it with the F1 which just muscles the transmission into gear regardless of the effect on the synchros. GL5 provides protection over GL4 through use of additives. Those additives tend to bind so tightly with the synchros that instead of the lubricant coming off metal is sheared off along with it. It could be that the additives in Valvoline bind less tightly. Sent from my iPhone using FerrariChat
I've read the other threads and am thoroughly confused. Everyone has conflicting opinions. What are you using and are you happy with it?
i think rifledriver is one of the few who can really answer with technical specificity. what are you trying to solve for? ie do you want to get rid of the cold second gear shift? if you want to do that you will need MTL. MTL is a little lighter than MT-90. with no relevant expertise i wld be shocked if MTL did any damage to your car. in the saharra desert i cld see MT-90 being better. like i said in my post i have experience with MTL in my 355 and 512tr, and it offers a noticeably better shift than the 75w90., and it cures the second gear cold shift.
I'm just looking to do a fluid change. I drive the car rarely and don't abuse it. Reading all the threads makes me feel like I'm either going to destroy syncros or destroy gears.
Tom- Yup, those are the choices, GL4 for manual transaxles and GL5 for hypoid gears. And we need both in one container. I use Valvoline Synthetic 75W-90 and have for 13 years with no problems, but there is a specific warning on the container for what to use in synchromesh transmissions. You pick your own poison. My 575's transaxle is likely a bit tougher than one of the V8 transaxles, too, because of the much higher torque. Image Unavailable, Please Login
This is a good thread to read. 360 f1 gearbox oil https://www.ferrarichat.com/forum/index.php?threads/360-f1-gearbox-oil.551557/ Remember all the newcomers, although rifledeiver doesn’t post much in the 360 forum lately his opinion and advice are pearls we should all weigh heavily. I liken it to Bobby fisher giving advice on chess moves. I found the LSX oil and had it shipped directly from Italy. A bit pricey but it’s for my one car, and quarts work well for my personal application. Sent from my iPhone using FerrariChat
I’ve been through that thread. And while Rifledriver may be the smartest guy in the room, he doesn’t seem to give any specific answers as to what HE uses. Maybe it’s for legal reasons, or for his professional “secret sauce”. I’m not looking to make this a career of determining which oil to use, I just want to do an oil change. Now, I’m sure it doesn’t matter, but the car is gated and not an F1. It’s just frustrating that it has to be this complicated.
id use MTL and see how you like it. if it doesn't make you happy then go back to the 75w90NS. in general my irrelevant view is Ferrari systematically recommends too heavy of oils.
Correct. He never quite says what he uses, but the strong inference is GL4. That is below factory spec which is probably why he won’t say to use it. I have done two annual fills with Redline GL4 (with limited slip additive) and at the last fill had the oil analyzed by Blackstone. No appreciable steel or iron content. But if your hypoid gears wear out as a result, I’ll probably be in the same boat. Synchros seem happy, as shifts are much smoother than when using GL5. FWIW, I drive spiritedly, but don’t drag race or speed shift. Sent from my iPad using FerrariChat
Tom- There is no difference between a 3 pedal Ferrari transaxle and an F1 transaxle. Guts are the same and only what makes the clutch engage and gears shift is different. You can easily swap the two, as is done quite often.
I think you are right about Brian Crall...I recall private messaging him, probably over a decade ago during a thread about which transaxle fluid to use, and he said I should probably use Redline 75-90NS with no slip additive unless needed and if the car shifted poorly, his solution was MTL, which always gave favorable results with bad shifting transaxles. Dave Helms told me he preferred not to use MTL and stick with Redline 75-90NS. Guess what I ended up using?
I have to agree with this. There is a thread where Brian does discuss it but doesn't flat out say what to use. You can read between the lines of his responses and I would say it is a good assumption that RL 75w-90NS is his preference. That is what I use with no problems.
75W-90NS is GL5. It works but is not great for synchros. One line from Brian’s posts sticks out in my mind. Something about having a box full of worn out synchros from people following the factory recommendations. Sent from my iPad using FerrariChat
75w-90NS is what the factory calls for no? i think MTL is the right answer. If there were no issues from owners using the factory spec would we be having this conversation over and over?
That same line is what stood out to me as well and made me switch to MT-90. My gated car seems to shift smoother with it in than the 75W-90NS GL5 that was in there before it. This also included track driving. Sent from my iPhone using FerrariChat