Check oil manufactures data sheets
You want a good CCS value to protect at cold starts
Just for a example only
HPR5 is @6400,
vs
Castrol edge 5w @6030
Cold Crank Viscosity
Low temperature viscosity
(mPa∙s) Max (CCS)
0W
6200 @ -35
5W
6600 @ -30
10W
7000 @ -25
15W
7000 @ -20
20W
9500 @ -15
25W
13000 @ -10