Mixing 10w30 oil with SAE30 oil?
I have a 1970 Honda CL350 motorcycle, it calls for 10w30, however it may call for something different now that temperatures are around 40F.
I had the bike filled with 10w30 a while ago, but the the bike burns/leaks a little oil, so when it started getting low I added some SAE30 since I had no 10w30 left. Is this alright? Especially considering the temperature outside? Should i hurry to drain the oil and refill with correct oil or is this fine for now?
Never mix oils with different viscosities… Mucho problemas… Their other components like detergents and other additives may produce adverse reactions even if the two oils don't.
It shouldn't hurt your bike to run with a bit of straight 30 in there. Change the oil at the next scheduled. In the meanwhile, buy some of your usual 10w30.
Mixing oil viscosities like that really isn't that big of a deal bit I wonder; are you using motorcycle oil? Not a lot of SAE30 motorcycle oil out there… Not saying there isn't any… Just saying there's not a lot. Motorcycles typically don't call for single weight oil and if it's not motorcycle specific oil, it probably has friction modifiers in it which will soon screw up your clutch.
As long as your added 30W was a JASO approved oil you shouldn't have any problems.
The old CB CL twins aren't that fussy with their oil requirements. However regular & fairly frequent oil changes are needed. Original recommendation was 1000 miles between changes. With modern oils I'd still do it about 2000 miles (say 3000 km) Air cooled engines that rev like these shorten oil life. Make sure you clean out the centrifugal oil filter at each oil change. Odds are that you find a fair amount of aluminium powder in it. Don't die of fright - the most likely source of this is the sides of the cam chain tunnel caused a worn or poorly adjusted cam chain tensioner.
As others have posted oil friction modifiers can play havoc with the clutch - use older style (& cheaper) multigrade oil. I used to run 30W40 in an old CB350 that did over 65000 miles
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