initially it was around 10-15 degrees outside. yesterday which was 25 degrees, i went out and heated up the garage some, and checked battery voltage which was good. It started right up, so now i feel better about it. I am not gonna start it up anymore. When warmer weather comes, i plan on putting synthetic in it. I did notice one of the slip ons was leaking a little at the clamp, does anyone think that adding a small film of high temp silicone on inside of the muffler would cure that? thanks