I use 98octant all the time,, either BP or shell, i prefer BP, but at least i use primium 95octant if no ultimate 98 avaliable
for the 2T i use the mobill synthetic fortify, when i buy the motul 800 i ask the shell is it ok for 2-stroke motorbike like NSR,rgv and he said is fine.. but i guess they are not so professional...
im told that the shell 100 is no good for 2stroke bike though, not becasue of the 100octant but the additives of the fuel, like i guess the ethanal and other additives.. my friend he tried the octant 100 and find he gain more low rev power which 2-stroke dont really have, but probably not good for the engine.
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MC28, Repsol