All right, so here's the newest answer from Castrol Headquaters in the UK, Thursday, the 4'th of June, 2020.
I telephoned them this afternoon, and asked them a couple of questions:
1/ What is going to happen to the following oil: "Castrol Syntrans Transaxle" ?
- answer from Castrol Customer Services: That is going to be rebranded to a new name, called "Transmax Manual Transaxle".
- answer from Castrol technical department: That is going to be rebranded as "Castrol Trnnsmax Manual Transaxle".
2/ Okay, so will the new named oil be exactly the same, or will there be variations in content, such as for example additives?
- answer from Castrol Customer Services: I don't know, you'll have to speak to the Technical Department.
- answer from Castrol Technical Department: No, it will be exactly the same oil, same additives, same content as the current Castrol Syntrans Transaxle, that is being phased out.
So, no changes in the oil or phosphor being added?
* answer from Technical Department: No, absolutely no changes.
3/ Alright, there are messages from the North American market, that it is no longer available, while I can still get the Castrol Syntrans Transaxle here in Denmark. How is that?
- answer from the Castrol Customer Service: Well, the Castrol Syntrans Transaxle is not available on the North American Market. But it is widely available in the EC, plus Australia, Ukraine, and a few more countries. The new named oil, will follow the same markets. Not available in North America.
- answer from the Castrol Technical Department: Well, the Castrol Syntrans Transaxle was never available in the North American market. That said, it was being imported in the the US by companies, and sold on. So, if those stock are being used up, there will be no more of that oil. The new name: Castrol Transmax Manual Transaxle 75W90, will be marketed the same way, not being available in the North American market, unless, as now, it is being imported by other companies, and sold on. So the situation will be the same.
4/ Ah okay, so what about the old stock, how long is that going to be able to be stored and used with no ill effects?
* answer from Castrol Technical Department: Well, the oil is not supposed to be stored for many years, and I'd say between 3-5 years, and after that, I would throw it out. The lubrication is no longer the same as new oil. So usefull life is 5-6 years. The old Taf-x that some stored for years after it went out of production, is no good any more. And the present Castrol Syntrans Transaxle, now being superseded by a re-naming, same content: Castrol Transmax Manual Transaxle, is a better product. No idea in using the old Taf-x
5/ But what about the recommendation from Lotus?
* answer from Castrol Technical Department: well, the old Taf-x was the only oil that Lotus approved.
(not to self: we know better, as Lotus later on approved the Castrol Syntrans Transaxle oil).
6/ Speaking of oils, what happened to the old sportscar oil from many years ago?
* answer from Castrol Technical Department: Ah, you mean the Rs oil. Well, that went through a few updates with new content, stronger film life etc, and became the FST Ti with titanium additive. We dropped the old version, and went on using the BMW approved version, as it was stronger. That oil was then rebranded to present day Castrol Fst Ti Supercar, as it was approved by Swedish Köenigsegg", and to make awareness of that, it was rebranded. No changes in content compared to the FST Ti version that it superseded.
7/ What about the GL4, GL4+ and the GL5 standards?
* answer from Castrol Technical Department: well, I have personally never seen any samages in a gearbox using GL5 in recent years, but we always recommend to be on the safe side, the GL4 or GL4+, and the old Taf-X was a GL4+ oil. So is the present Castrol Syntrans Transaxle, and the new Castrol Transmax, Manual Transaxle.
There was in the beginning of GL5 standard, some examples of hard pitting in some bigger gearboxes and on other big machinery, but that content of phosfor and other additives was changed a bit and it should be okay now. But as I said, we recommend staying with the GL4+ as specified.
The thing that it did, was that it bind itself with water in the gearbox, and creates an acid that can attack the surface of soft metals, like for example brass syncros. Hence the GL4 and the GL4+ remaining. It's not like if you add it, the GL5 oil, next day there will be dissolved syncros etc. And today the content is slightly changed, and we haven't seen problems for some years.
again, stay with GL4+ and be on the safe side.
Thank you for your time and help to solve this, sir.
* answer from Castrol Technical Department: well thank you sir, If you write me an email with the questions, I'd be happy to write you back and you can post it on the forums, so people can be sure about what is happening.
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That was our conversation, and I believe it clarifies a few questions:
a/ the Castrol Syntrans Transaxle 75W90 will remain the same content, but have a new name: Castrol Transmax, Manual Transaxle 75W90.
b/ The oil have not been officially imported into the North American market, but those companies who did on their own initiative, will be able to do the same withe the renamed oil.
I think that should
clearify it all.
The choice is now yours.
Cheers,
Redfox