I am reading yet another xW20 low viscosity debate. Then I realized this new lower viscosity may be perfect for the snowblower.
When I clear snow the highest temperature is about -10C (14F) and more typical is around -20C (4F). This past winter I used it only for half of the recommended OCI (mild winter). Most runs are about 15-20 min, then a short break.
Now the manual and manufacturer's site (Briggs&Stratton) have no recommendations below 5W30 which is for the +5..-30C (+40F..-22F) range (arrow points down and doesn't terminate at the low range end). I am thinking that since I never come even close to the high end of this range that 5W20 may be more suitable. Also as it has less viscosity improvers it would shear less, etc. Plus of course the improved startup wear protection.
What do you think? Is 5W20 good enough for small air cooled engine in winter (colder climates)? I assume that it doesn't appear on the manufacturer's docs simply because it is new and was rare in the past. Opinions.
P.S.: If the choice were between a 5W20 synth, a 5W20 dino and a 0W30 synth (such as GC), which one would you choose?