I use motul RBF600, I dont want to have to change my fluid as often as RBF660 requires but needed more than oem.
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France
prietenii mei... baga motul cu certificarea aferenta, ziceau ca e o idee mai silentios motorul.
On my C7, I moved up to the RBF 600 and it's been much better, handling the higher brake temps from the heavier car.
Motul 600 did great on the track!
However my "go to" oil in the last two oil changes was the Motul Specific 508 00 509 00 0W-20.
Last change , used Motul 8100 0W - 20 Full synthetic
Motul 8100 X Clean 5W30, used by reputable specialist Mini garages here in the UK and is in my 2018 JCW.
For such a climate as Mexico I'd stay away from 0w-20 and go at least to 0w-30 or 5w-30, last one being the OEM afaik.
Tbf my specialized mechanic put 5w-40 LL-04 Motul in mine for years and it's been blissful.
4100 turbo light? It isn't JASO MA specified for motorcycles and wet clutches. No damage from oil. Probably just rough gear changing and maybe rough on the clutch plates but you should be fine.
I won't recommend Motul for Gixxer 250
10w-50 7100 makes the engine run a little hot and refinement goes for a toss (Personal Experience) even Gixxer riders group agreed on this one and it is not even as good as Ecstar oil used in the showroom.
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