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Hi Harry, I sell oil for a living and you are welcome to call me at work during the week 03 9555 7510 all these bikes must run a synthetic, but it must also be suitable for a bike, that is the catch. Bike oils have no friction modifiers or the clutch will slip. Anybody who tells you not to run synthetic oil knows nothing about oils.
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Firstly there are plenty of synthetic oils without friction modifiers so there are no any catches and second, your statement -"must run a synthetic" is a complete rubbish coming from an oil salesman. Any oil meeting SF-SJ with MA in JASO specs is absolutely fine. Most of the riders here use semi-synthetic Motul oils and few mineral oil as well and we haven't hear yet an engine failure from using a non synthetic oil on this forum. Looks to me like it is you who knows nothing about oils which is surprising for someone who sells it for a living
"It is not a shame to not know, the shame is to not know and not to ask"