Originally Posted by Whammo
Originally Posted by Char Baby
At -20°f yes. I'd say that they're very similar. It's when its even colder e.g. -30°f or-40°f that a synthetic oil would be showing its benefits. Other ways too but you're asking specifically about cold temp starting.
Wouldn't you be looking for a 0w for anything colder than -30f anyway?
Absolutely!
Two vehicles in my sig(Altima/Civic) are using 0W20 oils and we're only getting down into the teens and maybe down to Zero overnight. But, we're using 0W20 for other reasons than just outside temperatures.