Synthetics work great in Snowblowers and other yard equipment 4 cycle engines but be careful of ester based synthetics.
I had a serious problem with the original GC in one, the stuff is an attraction for moisture.
I couldn't get the engine to turn over, i put oil in the cyl in the spring but didn't change the oil as it only had a few hours on it.
Overnight in the warm garage and it turned over like normal, i started it and let it warm up then changed the oil.
It was milky white on an air cooled engine! Now its Mobil 1 0w40 in everything small 4 cycle engine, no problems pulling it easily without the electric starter @ 0f and this is a 12HP.