13+ years on Kawasaki Versys 650 (150k km, change every 10k plus, very quiet operation, smooth gearbox, maneuverability, 100% synthetic polyolefin and not painted synthetic mineral oil.

This specific one has been enhanced with pseudosilver as an additive anti-friction, its specifications exceed beyond the classic use in car engines and motorcycle use (Jaso ma) where the engine, gearbox, and clutch have a common oil sump.

Update July 2022:
Nothing has changed, it continues to be the top 10w-40 100% synthetic oil on the market, the operation of my Kawasaki Versys 650 07 is impeccable despite having 160,000 kilometers. I have only used a different oil a few times, and only if I couldn't find this specific one... the engine has a sweet running-in which I cannot confirm in Versys friends (with 30-40 thousand km) who use other lubricants... but it has become expensive, I used to buy it for 8 euros. I recommended it to a friend who owns a Varadero 03 with 150+ thousand km, and he, as an owner, immediately noticed improved maneuverability and power beyond the usual, he also saw a slight decrease in oil consumption in the next change.

Expensive (previously hard to find and cost 12 euros per liter) but worth its money.
I have been using it for years and I have no regrets, but be aware that it is not exactly a liter, but approximately 946 ml.
So, for the first time, you will need 5 packages.