They are an OEM for a few manufacturers. Held in high regards by all accounts. Rare to find in the uk though I think.
this is also my conclusion. Because of their rarity over here, prices are not discounted so quite expensive (similar to motul 300V). So was interested to see if anyone has used it. May look at vavoline synpower which is substantially cheaper.
Best I have used was Silkolene Fuchs Pro 4 Energy. Not cheap at around £50 but in my Blade it made starting and running better and the noise from the gearbox deffo was quieter. The blurb seems to back this up too. https://www.silkolene.com/motorcycle/4-stroke-engine-oils/pro-4-energy-10w-30/
