question for the experts.

[mickeeand]

I have a 94 honda cb1000(the big one)that I bought used. I am wanting to do and oil and filter change. I have two bottles of castrol 4t 20w-50 that I want to use. The service manual states it ok to use this weight oil. The bikes recommended oil is 10w-40. Should I mix two bottles of castrol 4t 10w-40 with the 20-50? Or not mix? I have been reading a lot on the hdeos in 15-40 and the syn 5-40 with good results. Just thought I would ask since I have two bottles of 20-50 handy. Thanks, Mike

 

[RD400]

If you need to use the 20W-50, I see no worries about mixing it with the 10W-40. Summer is coming anyway, and your bike probably won't feel the difference.

 

[mickeeand]

Thats what I thought as well. I figured that it would shear down anyway and I do short oci anyway like 1500 to 2000 miles.

 

[sunruh]

sure mix it, no big deal. and be ready to dump it in 3k miles or less. in my testing of castrol 4T it was.......very under performing. and by that i mean it was so lack luster that they should pay me to use it, not i pay them.