I grew up on 10-30 or 20-40. This is SoCal. No freezing, lots of heat.
Synth oil is nice, but expensive. The concept of 0-20 oil, although
the manufacturer suggests/demands it, is just alien. We never freeze,
we just have to worry about the oil thinning out when the ambient is
over 100F.

I assume I'm worrying needlessly now, but I'd like to know why.

--
Cheers, Bev
It's 95% of the lawyers making the other 5% look bad.