04-07-2014, 01:19 PM
I think it is safe to say we all know the oil charts and what is better for different temperature ranges but it has been shown to be a fact that the mother ship Honda has deemed in their service manuals for our bikes that they recommend 10w30.
Now in Japan the temperatures do get up into the 90's and it is a tropical humid 90's, spent four years overseas and can confirm this. With the high humidity and 90 plus degree weather you would think they would recommend more than just the 30 weight oil but hey that is what they recommend.
Like I have said, each bike may look alike but each bike is different. Some may run just fine with 40 weight oil while others will gripe about it until you go back to 30 weight oil. If you can run 40 weight and your bike isn't making noises or that you don't notice as they may be so minor unnoticeable noises then go for it. I do believe this thread was just stating what the service manual calls for, or recommends when changing the oil in our bikes.
Now depending on what chart on what website you go to our what book you go to it is hard to say the differences on some. Here are just a few.
![[Image: fa9ab3a5563f17642ff3523772cb9da4.jpg]](https://cb1100forum.net/forum/uploads/imp/201404/fa9ab3a5563f17642ff3523772cb9da4.jpg)
![[Image: de218e28e186f29e68d0d09b10f0e749.jpg]](https://cb1100forum.net/forum/uploads/imp/201404/de218e28e186f29e68d0d09b10f0e749.jpg)
![[Image: 0b8b8d0bd6c133780d574a03d1447b12.jpg]](https://cb1100forum.net/forum/uploads/imp/201404/0b8b8d0bd6c133780d574a03d1447b12.jpg)
Note two of those charts you would be hard to tell the benefits of the 40 weight over the 30 weight but rather the 30 weight has a lower operating temp but on the upper end of the temperature scale it just points off the scale for both weights.
The point being, run the viscosity of oil you want to run, just bear in mind Honda recommended 10w30 and they must have had a reason to do so. If you run 40 weight and have no problems or noises I applaud your bike for being able to handle it and or your cam tensioner is adjusted or set properly....
Keep the wheels down and enjoy the ride!
Sent from my Nexus 7 using Tapatalk
Now in Japan the temperatures do get up into the 90's and it is a tropical humid 90's, spent four years overseas and can confirm this. With the high humidity and 90 plus degree weather you would think they would recommend more than just the 30 weight oil but hey that is what they recommend.
Like I have said, each bike may look alike but each bike is different. Some may run just fine with 40 weight oil while others will gripe about it until you go back to 30 weight oil. If you can run 40 weight and your bike isn't making noises or that you don't notice as they may be so minor unnoticeable noises then go for it. I do believe this thread was just stating what the service manual calls for, or recommends when changing the oil in our bikes.
Now depending on what chart on what website you go to our what book you go to it is hard to say the differences on some. Here are just a few.
Note two of those charts you would be hard to tell the benefits of the 40 weight over the 30 weight but rather the 30 weight has a lower operating temp but on the upper end of the temperature scale it just points off the scale for both weights.
The point being, run the viscosity of oil you want to run, just bear in mind Honda recommended 10w30 and they must have had a reason to do so. If you run 40 weight and have no problems or noises I applaud your bike for being able to handle it and or your cam tensioner is adjusted or set properly....
Keep the wheels down and enjoy the ride!
Sent from my Nexus 7 using Tapatalk