Tech Facts, Not Myths
In particular, I thought this was interesting.
"Here are a couple of examples that I am personally familiar with, of using far superior 5W30 Resource Conserving Automotive motor oil in wet clutch motorcycles:
A Mechanical Engineer Colleague of mine has a wet clutch 2006 Suzuki GSXR 1000cc Sport Bike with around 7,000 miles on it, at the time of this writing. He is running 5W30 Quaker State Ultimate Durability (often abbreviated as QSUD) synthetic, Resource Conserving Automotive motor oil in it. And he has NOT had any problems at all with the clutch or shifting. At this time, that oil ranks 4th in my Engineering Motor Oil Torture Test, Wear Protection Ranking List, out of 229 motor oils tested so far.
And as a matter of fact, he was so happy with that 5W30 Quaker State Ultimate Durability synthetic, Resource Conserving Automotive motor oil in his Suzuki wet clutch motorcycle, that when he got a new 2018 Yamaha XSR900 Triple wet clutch motorcycle, he used that oil in it as well. So far, his Yamaha has fairly low mileage on it, but he has NOT had any problems at all with the clutch or shifting. He highly recommends using that or similar 5W30 Resource Conserving Automotive motor oil in wet clutch motorcycles.
Simply put, it is NOT true to say that wet clutch motorcycles cannot use 5W30 Resource Conserving Automotive oil. The fact is:
Virtually any wet clutch motorcycle will work just fine with most any automotive oil, including 5W30 Resource Conserving oil, as long as the clutch is in good condition.
Just below is a comparison between the top High Performance Automotive 5W30oils and the motorcycle oils I have tested (the higher the psi, the better the wear protection). Keep in mind, that my Engineering Motor Oil Torture Test determines every oil’s “film strength/load carrying capability/shear resistance value”, which all mean the same thing and exactly apply to motorcycle conditions with the transmission gears sharing the same oil with the engine, and are represented by the psi value posted in my Wear Protection Ranking List.
Therefore, my testing DOES take into account a motor oil’s capability to withstand with the higher levels of mechanical shearing found in most motorcycle engines. Oils marketed as “Motorcycle Oils” sometimes make claims about their better ability to deal with the higher levels of mechanical shearing found in most motorcycle engines. But, my Engineering Testing shows that those motorcycle oils are only making false advertising claims that do NOT stand up when actually put to the test.
* 5W30 Amsoil Signature Series synthetic “automotive oil” = 134,352 psi, ranked 3rd out of 229 motor oils tested so far.
* 5W30 Quaker State Ultimate Duty synthetic “automotive oil” = 133,125 psi, ranked 4th out of 229 motor oils tested so far.
* 5W30 Motul 300V motorcycle oil = 112,464 psi, ranked 25th
* 10W40 Mobil 1 Racing 4T motorcycle oil = 93,661 psi, ranked 90th
* 20W50 Mobil 1 V-Twin motorcycle oil = 75,855 psi, ranked 163rd
* 10W30 ProHonda HP4S motorcycle oil = 66,852 psi, ranked 205th
* 10W40 Valvoline 4 Stroke motorcycle oil = 65,553 psi, ranked 210th
* 10W40 Spectro Motor-Guard High Performance Motorcycle Oil = 57,977 psi, ranked 224th
As you can see, the best High Performance Automotive oils provide FAR BETTER engine and transmission wear protection than most “motorcycle oils”. And as mentioned above, automotive motor oils also typically provide more HP and better MPG, compared to the lower performing motorcycle oils.
Most motorcycle engines:
* Make far more power per cubic inch, than car engines.
* Rev far higher than car engines.
* Typically get run much harder than most car engines.
*Share the same oil for both the engine and the transmission, which subjects the oil to considerably higher levels of mechanical shearing.
Therefore, I recommend using High Performance Automotive oils in motorcycles, wet clutch or not.
So, at the end of the day, motorcycle owners have to ask themselves if they really want to run a poor performing motorcycle oil in their beloved bike, or if they would be better off using a FAR SUPERIOR High Performance Automotive motor oil? The choice is theirs."