A7 OOH Posted November 3, 2018 Share Posted November 3, 2018 My 2005 Caterham is fitted with the 6 speed box.How often should the gearbox oil be replaced.What oil should I be using- Caterham state Comma GL4 or GL4 75W80 if post 2013, Is the latter an updated oil or has the 6 speed box been modified since 2013.Cheers Link to comment Share on other sites More sharing options...
rj Posted November 3, 2018 Share Posted November 3, 2018 I've been told that the best oil is a Shell Spirax S3 80W - not to be confused with the S3 80W/90 (!)Not easy to find; had to buy a can of 20lThis is purely a GL4 oil; don't use anything else (not a GL4/5!!) Link to comment Share on other sites More sharing options...
Area Representative Geoff Brown Posted November 3, 2018 Area Representative Share Posted November 3, 2018 Any good GL4 transmission oil across the accepted range will do. Multigrades are flexible but you can use a single grade like an 80W. Caterham used to recommend this way back in days of yore.My six speeder has Halfords 80w/90 in it since build with no problems.There is no definitive service period for the changing of gearbox oil but I would suggest every six to eight years depending on usage. That is if the car does the 'regular' Seven annual mileage of 3000 to 4000 miles.More important is changing the LSD oil. I do that religiously every 3 to 4 years irrespective of use or mileage. Link to comment Share on other sites More sharing options...
CycleSi Posted November 3, 2018 Share Posted November 3, 2018 Redline MTL is considered to be the best oil for this gearbox. Link to comment Share on other sites More sharing options...
A7 OOH Posted November 3, 2018 Author Share Posted November 3, 2018 Good selection to check outthanks Link to comment Share on other sites More sharing options...
ChrisC Posted November 3, 2018 Share Posted November 3, 2018 Redline MTL recommended to me by Road and Race. Link to comment Share on other sites More sharing options...
rj Posted November 3, 2018 Share Posted November 3, 2018 That's new for me. It used to be the Spirax stuff Phil recommended but that may be years ago.(Good this was not just a link to an old post) Link to comment Share on other sites More sharing options...
aerobod - near CYYC Posted November 3, 2018 Share Posted November 3, 2018 Redline MT90 (which is 75w90) also works well, depending on how hot the car gets. For trackdays when the temperature was above 25°C I found the gearbox became noisy using MTL or with the standard 75w80. The gear change with MT90 does require some patience when ambient is near 0°C, until the gearbox has warmed up a bit. Link to comment Share on other sites More sharing options...
Wrightpayne Posted November 3, 2018 Share Posted November 3, 2018 I’ve used Redline MTL (as suggested in numerous previous threads) and comma as recommended by Caterham and TBH couldnt tell any difference!I use Comma currently as its more readily available.Ian Link to comment Share on other sites More sharing options...
ChrisC Posted November 3, 2018 Share Posted November 3, 2018 Yep - had the misfortune to need a rebuild of my 6sp last year under warranty, where he recommended MTL, so that was Jan 2018 info. Link to comment Share on other sites More sharing options...
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