B238170 - This product cleans the INSIDE of your motorcycle engine. Dump the can into your warmed engine and let idle for 15 mins. Drain your oil, swap filter and put in your new oil. Perfect use is after digging a bike out of a long hibernation.. Use every other oil change to keep the inside of your engine clean. Your engine oil will stay cleaner when you use this product for a longer period of time and this also helps to restore engine compression. Good Stuff.