Just bought an Ariens Delux snowblower with a 305cc Briggs&Stratton engine. Right now I have what they call break-in oil in the engine, that i'm supposed to run for 2 hours. Now i've ran it for 2 hours, now i'm not sur what oil to put in. I would like to go synthetic. In the manuel it says to use 5w-30 for synthetic. Up here in Canada i can get -30 with the wind factor easily. Is synthetics the best oil to go with? And what kind. Thanks!