oil for my 1986 ypvs

[easytripperthethird]

hi to one and all

just wondering if anyone could help with oil selection for my bike.Its  intended oil is sae 10w30, i am being told i cant get this from
everyone i have spoke to and been advised to use 10w40

please if you have used this before and had no problems let me no as i have spent alot of time on my engine and want it to run perfect.

thank you fro your time

Wayne

[cb250g5]

What bike?

Engine or gearbox?

[flames]

why cant you get 10w 30?
sure I had some in mine.castrol from Halfords.

[bare]

Gearbox works V well (best?) with gear type oils. I found GL4 75/85 Gear oil to be a ..Major.. improvement over Yamalube.