Bel-Ray840-1548 Thumper Synthetic Ester Blend 4T Engine Oil 15W-50 4L

This oil is smooth as silk in my Yamaha Super Tenere. Would buy again without hesitation!

... will buy it again :)

Very good oil for mowers

The oil required for my 09 BMW F650GS is 15w-50 and I have used this synthetic blend oil for quite a few years. I've never had any problems with this oil and it is rated JASO MA2, so good for wet clutches as well.

My bike needs an oil with specific properties due to a wet clutch that gets hard offroad use. Does it's job perfectly and my clutch looks perfect with zero fade at high temperature

I have used this oil for many years on my 18 year old air cooled Honda XR 250.I have over 80,000 miles on this dual sport trail bike, changing oil every 300-500 miles of trail use. I have rebuilt the engine 5 times, so I am getting good miles per rebuild. I doubt you will find any XR 250 with this many trail miles on it still alive. Buying this oil by the gallon helps on price per quart.

I have used Bel-Ray, thumper oil, ever since I started riding 4 stroke's and have found it to be a superb lubricant with all of the qualities you look for in a motorcycle oil.

I use this in my DRZ400 based on multiple forums recommending this weight.I will say that the life of the oil - as judged by how easy it is to shift - is a little low at <1000 miles. But this only occurred after a pretty serious offroad + track incursion.It seems ok, I bet if I did an oil analysis it would either reveal that the oil I took out of my bike was still good to go or had been contaminated from all the tough stuff I went through.You can't really review oil without having an oil analysis done. The shifting feel is fine now, and the price is right.