I see this debate going on in every motorcycle forum continuously, so I am going to weigh in with my thoughts. Opinions on oil are plentiful, everyone has one. I have owned and maintained 60-70 motorcycles of all varieties and have never had one oil related failure These are the guidelines I go by.
Auto Oil or Motorcycle Specific Oil
These debates get HEATED but I never pay much mind. The argument for motorcycle specific oils is that motorcycle oils are shared between the motor and the transmission and clutch components. Because of this they face more abuse than an auto oil would inside of a car. The faces of the transmission gears mashing together cause significant wear to your oil, which is why it is best recommended that motorcycle oils are changed on a more regular basis than a car. Most vocalists for motorcycle specific oils state that you should use them because they have additives to keep your clutch plates from slipping and wearing out faster.
In my book (remember, everyone has an opinion) oil is oil. A good quality auto oil is just as suitable for a motorcycle and gearbox as is a motorcycle specific oil. Auto oils also cost 1/3 the price and are available everywhere. I do not want to be tied to a dealer to get my oil. Occasionally I need to change oil while out on the road. If you use a common auto oil you can stop at any auto store, Walmart, or gas station and pick up a few quarts.
As for clutch condition. I have always used cbd capsules canada auto oils in every one of my bikes. I ride my bikes hard and frequently, and over all the years of riding on all sorts of different machines, I’ve only ever replaced clutch plates in one of my street bikes. Clutches are built to last and as long as your oil is kept clean, they will.
Oil Weight and Viscosity
Thick or thin? Warm blooded or cold blooded? It doesn’t make a whole lot of difference unless you are riding in extreme conditions (very hot or very cold temperatures). Just like a car any typical 10w-40 weight oil is going to work great in most applications. Some prefer to run a 20w-50, but there really isn’t a huge difference. Again, I prefer to use something real common so I can find it anywhere I go.
Synthetic or Fossil Oil
This gets a lot of heat in the forums too. Quality synthetic oils have only been available for 10-12 years. Engines built prior to that time period were not designed to use synthetic oils and should therefor use fossil oils. A new bike with low miles will benefit in the long run by using a synthetic oil, it has been proven that they really do protect better.