Very bad oil. It was tested in an xt600e with a perfect engine. The bike previously ran with motul 7100 20w50 and after 4000 km the oil was still at the same level and in quite good condition. I put this one in along with a filter change, that is, 3.7 liters of oil according to the manufacturer, and it was full three days ago. And today I added 800ml. Where it went, I really don't know, I am left astonished. The bike ran much better with motul and tomorrow I will go throw it out and put motul back in. Really a waste of money.

I put it on a GSR 600, the whole noise of the engine changed and the gears are much smoother, I will definitely buy it again!

the best oil softens the sound of the engine and in scooters that may sip oil the same amount that I put always comes out

Very good oil. I use it on my Honda SupraX 125cc. I used to use the genuine Honda oil, but since I first used Bel-Ray, I will never go back to Honda.

I tried the Bel-Ray Thumper 15W-50 on a Zontes 310 T1 and the bike's temperature increased more easily, the engine sound became deeper, and the gearbox had a harder time shifting gears. I replaced them with the Motul 7100 10w-40 and the bike calmed down.

I put them on a Suzuki GSR 600. I had the Motul 7100 and after 3500km I switched to these Bel Ray ones. Okay, the gearbox went into silent operation. As for the engine, I will come back when I do some kilometers to see any potential differences. I highly recommend them

I have been using it for years. I think it's the best value for money. I'm not an expert, but as a recommendation from a mechanic, I have chosen it since I first bought it.

What can I add?
Indeed the best oil. The engine works more freely and the gears shift perfectly. I recommend it.

Owner of a Varadero mk2 2005 and I installed them yesterday to try them out! Perfect feeling! Immediately you feel the difference in the engine's performance! When I bought it, I used Valvoline 10/40 but I could really hear the engine being very dry and struggling, and the gears sounding 3 kilometers slower! Everything has been corrected! I will come back with impressions once I reach around 800-1000 kilometers!

I put it on my Suzuki Address 125 scooter and have been using it for three months, and even though I tried other expensive oils, this one makes a difference for me. The gearbox became buttery smooth, it has never been like this before, and the engine noise has noticeably decreased. I highly recommend it for Suzuki if you have a multi-cylinder engine, choose the full synthetic option, it can handle sudden increases in RPM