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I have just returned from getting my Lotus clutch fixed at specialists, Lakeside Engineering. A chap there by the name of Tim owns a 9000 Carlsson and reckons he used to munch through a gearbox in 9-12 months of heavy driving. However, he then changed to Castrol TAF-X synthetic gearbox oil and broke no more gearboxes. What do you think? Sounds too good to be true?

Despite running a Lotus garage, he still raves about the big Saab's and said that a few years ago, his Carlsson used to keep up with a mates Esprit whereas when he swapped seats into an Elise, he was left behind!
 

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As I recall, TAF-X is produced specifically for some VW transaxles, and if I remember it's a 75W-90 synthetic oil. There are several synthetic and semi synthetic 75W-90 multigrade gear oils about, including Castrol SMX (for more general use), Castrol Syntrax, and Mobil SHC. Unless you can identify a specific technical similarity, the best one I used is probably Mobil SHC. It gave me no gear selection problems when cold, and no "sticking in gear" problems when hot, which were the two problems with the standard 80 grade oil.

If you happen to have a limited slip diff, there are 75W-90 synthetics about with the necessary anti foaming additives for the limited slip mechanicals. Castrol XAF-XLS was one, Agip made LSX for Ferrari combined gearboxes and diffs and now Shell produce one for Ferrari, BMW have one for the M5 differential and so on.

One thing that does puzzle me is that Saab recommends an engine oil, and all the above are definitely EP type gear lubricant.

It wouldn't do any harm to call Castrol's technical department. Also, I don't really see why you couldn't change to one of the above oils and give it a try. If it obviously wasn't working well, change back. If you don't have an LSD, I'd probably chose Mobil SHC 75W-90, but it's quite difficult to find these days. Try Mobil's helpline or Demon Tweeks.
 

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Well I went on the hunt for this oil, but it's only sold in 500ml at about £6.00 a bottle


I was told to try the motor factors Brown Bros, who can get me a box (6 bottles/3 litres)for £21.00 + vat, so my order is in!!
 

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Originally posted by johnw:
[qb]Well I went on the hunt for this oil, but it's only sold in 500ml at about £6.00 a bottle  
 

I was told to try the motor factors Brown Bros, who can get me a box (6 bottles/3 litres)for £21.00 + vat, so my order is in!! [/qb][/b]
Should have said something, I've got an account there, may have been able to get it less. And I thought they just did paint... Think I may have to get an order in as well
 

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Ok, quick question before I get some. Is it suitable for a 1978 99 turbo, or should I stick to engine oil in there?

Cheers.
 
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