Originally Posted By: dlundblad
Originally Posted By: OVERKILL
Originally Posted By: dlundblad
Originally Posted By: meborder
Dangit!
There goes my idea of using 0w30 in my plow truck to help it start at -15f ....
Sonny-beach ....
I hope this is meant to be sarcastic.
At these temps, 5w30 and 0w30 could very well be identical.
You better research your oils spec sheets.
-15F? No, they won't be. That's almost -30C, which is the CCS temp for the 5w-30 grade. The 0w-30 will be MUCH thinner; probably HALF as thin, at that temperature.
Like I said, review the spec sheets. We don't know what meborder is running.
Half as thin? How can you be sure?
Due to the halving rule. Take your typical 5w-30, it is limited to a max CCS cP of 6600 @ -30C. At anything below around -15C, viscosity measured via CCS or MRV roughly double per every 5C.
A 0w-xx has to be below 6,200cP @ -35C, which turns into 3,100cP @ -30C.