I bought a new Suzuki GS750 motorcycle in 1979. I still have it today, in like-new condition, with more than 55,000 miles on the odometer. This model didn't have a dipstick to check the oil level. Instead, it had a small round window in the right case cover, for easy viewing. At a glance you could see the oil level. Very convenient! Over time this window became clouded over, preventing me from detecting what the oil level was. That was rather annoying. Unfortunately, I was never able to find a replacement window. Not to worry, I thought, as the bike never used any oil between changes. One of those changes was to AMSOIL. (In 1979 I didn't know about AMSOIL or if there was such a thing at that time.) To my great surprise, after switching to AMSOIL 10W-30 Metric Motorcycle Oil, and putting on a few miles, that viewing window became clear! WOW! I couldn't believe it. AMSOIL cleaned the gunk off that viewing port. The oil level was now clearly visible, for the first time in years. One can only imagine what cleaning power it has on the rest of the engine! The only question is, Why would anyone use any brand of oil other than AMSOIL? Thus far I've found no satisfactory answer.

I've used Amsoil on my Motorcycles for 16 years. The first time I used it on my Suzuki Calvacade the shifting as smoother and Ansoil don't break down or discolor like other oils I've used did. Highly recommend Amsoil.

Great riding great price. Run Amsoil in my Harley and gsxr

Very good product use it in all my vehicle for the last 10 years never let's me down Keeps all my engine parts running smooth

I highly recommend this product. I now have three of my riding buddies using it now.

I have been using Metric Motorcycle Oil for over 15 years. I have put 79,000 miles on one bike, 68,000 miles onn another and 70,000 on a third with zero engine problems. I firmly believe Amsoil protects and enhances the lives of my engines.

Great product

I have used Amsoil in my motorcycles for years and thousands of miles with great results. Longer change intervals, cooler and smoother running engines and transmission shifting. No slipping clutches either. Great stuff!

You get what you pay for. In my opinion, this is the best oil you can find. My truck and motorcycle run so much smoother. I've been using that m stuff for years. I'm glad I switched.

I ride a 2014 Honda CRF250L 70% dirt,30% street. Previously used the Hondaline Synthetic thinking it was best available.Decided to try the Amsoil 10/40 , shocking difference from first start after oil and filter change. Smoother clutch action and shifting as well as knowing the Amsoil reputation for internal engine protection.My oil of choice from now on!

Seems to have stop clutch chatter, bike seems to run cooler and lengthened oil change intervals.

Oil that is clearly a top stellar performer.

I strictly use Amsoil products for my motorcycle. If you look at the comparison charts with other major synthetic oils there is no comparison. I go between 5K and 7500 and occasionalky 10K miles and it comes clean enough you can see through it and the magnetic drain plug never has filings on it. In the Goldwing the motor oil is also the clutch and tranny fluid. Shifts smoothly all through the miles from 1 to 5K.

What a great product; it cools the engine 12 to 15 degrees; shifts are smoother and the engine seems quieter. Also have the confidence that I have one of the best oils on the planet.

It is peace of mind to know this is best oil. Makes it a joy to run it in my Ninja 300

I will say it over and over again. I will not use anything but amsoil in my machines. Incredible smooth shifting

Excellent oil! Protects and lasts a long time. Highly recommend!

I purchased a pre-owned Can-Am Spyder last year. After changing the spark plugs and cleaning one of the sensors I noticed that the oil had never been changed. I bought the bike with 13,000 miles on it. I switched over to Amsoil 10w40 metric motorcycle oil and I can't describe how much better the bike runs. It's literally like it drove off the showroom. Throttle response is better, the motor runs cooler, the gears shift cleaner, even after one oil change the difference is phenomenal. I'm going to change the oil again in the next month just to make sure that we got all the particles and everything out of the engine. This is a phenomenal product and it's saved my bike. THANKS AMSOIL!

Used this for the first oil change after buying a new 125cc name brand motorcycle, could immediately hear a smoother performance on Amsoil vs the oil used by the dealer. These are high revving little engine and good oil makes a difference

I've been using using the 10W-40 Metric product in a CBR1000RR for most of a race season now with filter changes and a top up between weekends. Where most folks will change after every race weekend, I only had to do a full change after three, and I probably could have gone longer. My engine runs cooler and shifts smoother with this too. Can't recommend it highly enough.