The question is beening frased as a chatch 22, do you want your motor to last or start in the winter, below 10w anything is too thin , if the conditions are such that the eng. will not turn over fast enough to start you need to take other measures , heat - block, garage,ect. I've had more than one conversation with oil lab techs. and they say that below 10w starts[more thannormal] eng. damage , I'm sure alot of aditudes may pop up , but its realy just thinking about a problum , if you can not put some source of heat to your problum then there is usally more opptions, like using the thin oil and adding a pre oiler system , whitch is the best thing to do nomater what.

 

Well I guess I'll just keep it in the garage this winter. (Its not a daily driver, I'm trying to do a ...whats a good way to say cheap ...cost efficent rebuild)

 

Heh!!!!!! I was going to ask why he's using water (I run 50 weight in the Harley!).

 

Synthetic v-twin motor oil ~ $8 quart, but u prolly already knew that!!