I am aware that the mobil 4t is recomended but as I said I cannot find any in town olny 10/40 that was wy I asked . In one thread It was stated that some of the 10/40 was not jasmo rated but all I have found are and I just wanted To know if anybody was running it and if they felt there was a noticable difference between the 15/50 or 20/50
 
I believe that Mobil 4T is out of production these days.......which is prolly why you can't find any......
 
Mobil 1 4T Racing 15W-50 is recommended by Triumph as an alternative to the 10W-40. I used the 15W-50 for the first time recently and I definitely noticed a difference in gearbox operation, I wont be going back to 10W-40.
Interesting - Over here a lot of Triumph (and other) dealers are moving to Bardahl.

In anything without a WET Clutch - Good Turbo Diesel Oil.
 
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