I used it on a Yamaha FZ6 Fazer '2004 with 60,000 km.
In recent years, due to obligations, I do about 2,000 km/year. So I change the oil (myself) every year, and earlier than the 3,500 to 5,000 km that this engine requires.
Even so, the oil after 1,000 to 2,000 km was coming out pitch black, so I turned to this product.
The bike had Amsoil 10W40 in it, and I poured in the cleaner after it had idled for 10 minutes. This time, with the cleaner, the oil came out like tar!!!
Then I put in new Amsoil 10W40 again with a K&N filter.
The difference is obvious, since for the first time I felt the Amsoil working like this.
A little quieter engine, but mainly better revving, like when the engine was new. Also better flexibility of the engine at low revs.
We’ll see what color the oil will be next time..
Edit 19/9/2026: After 500 km the oil is now crystal clear. Also, after the cleaning, fuel consumption dropped from 7.2 lt/100km to 6.5 lt/100km on the same routes.

You don't need it for your engine unless you haven't changed the oil for years; the oil does the same job by itself

I have used the Beverly 300 of 19' twice so far, always a noticeable difference "quiet motor" kilometers 107 thousand!

I used it on a V-Strom 650 at 85,000 km before changing the oil. I put it in a warm engine after a long ride and ran it at idle for about 10-12 minutes. Afterwards, I changed the oil and filter, and after the first ride, when I went to check it again, I checked the oil and saw that I had this brown stain on the always crystal-clear window, and now after another 2 oil changes at 95,000, it is still there. So I think it may cause damage if such things come loose inside the engine. I will have to remove the clutch cover now to clean it from the inside. Stay away.

You see a difference immediately. Of course, after applying the product, the oils AND the filter should be changed

It was installed on a Suzuki SV650 with a 2.5 liter engine. This particular bike has a glass oil indicator which had become cloudy internally due to deposits. I did an oil change using 50ml of cleaner, left it for 10 minutes as the instructions say, and then added the remaining 200ml to the new oil, left it for another 15 minutes, and changed the oil again. The indicator didn't show any difference at all, maybe I saw a slight difference mechanically and in terms of performance..? It could easily be just my imagination. Perhaps it is good at preventing sludge and dirt.

I put it in an oil change on my Suzuki GSR600 with 65000km, the old oils didn't come out very black, but I have the impression that the engine works MUCH better and more lively after 200km from the change.

I used it before changing the oil in my Suzuki Address scooter and it really removed black gunk and dirt from inside. After the oil change and using the cleaner, I feel that the scooter is quieter and gives a more lively engine sensation.

For better results, warm up the engine, put in the flush while the motor is warm (not hot), and take a 10-minute leisurely ride.