Andy Mac Posted September 8, 2021 Share Posted September 8, 2021 I have a 6 speed box on a 420R.Nothing wrong with it, but they are noisy. So I will swap out the oil to see if an alternative works better to reduce the whine on overrun.I am sure this has been done to death, but recommendations please. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted September 8, 2021 Member Share Posted September 8, 2021 Which gearbox is this?JonathanFor the Caterham six speed box the best two threads I can find are:"Which 6 speed gearbox oil?" (2001) "Caterham 6 speed gearbox oil" (2018) Link to comment Share on other sites More sharing options...
Grant_7 Posted September 8, 2021 Share Posted September 8, 2021 Out of interest, is your overrun at its worst in 6th? Link to comment Share on other sites More sharing options...
ScottR400D Posted September 8, 2021 Share Posted September 8, 2021 I used Comma first then changed to Redlne MTL which I feel gives slightly smoother changes. Can't say I've noticed any difference in overrun noise and I agree, 6th is worst. Nothing noticeable in 5th , 4th better than 6th but still some noise. Not really thought about the lower gears. Link to comment Share on other sites More sharing options...
John Vine Posted September 9, 2021 Share Posted September 9, 2021 I use Comma SX 75w-90 GL-4 Semi Synthetic.JV Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted September 9, 2021 Member Share Posted September 9, 2021 Is this for the Caterham six speed box or the SADEV sequential box used on the 420R?ThanksJonathan Link to comment Share on other sites More sharing options...
Area Representative Geoff Brown Posted September 11, 2021 Area Representative Share Posted September 11, 2021 Three Sevens - two 5 speed & one 6 speed all filled with Halfords 80w/90 GL4 mineral. Never a problem with noise or gear selection. Link to comment Share on other sites More sharing options...
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