My Ariens snowblower engine manual has this to say about using an extension cord for electric start:
Use appropriately sized extension cord (a minimum of 16 gage, 3-wire, 13 amp, no longer that 25 feet, and suitable for outdoor use) to prevent damage to electric starter.
I would have thought that, at the end of the day, the only thing that matters (apart from the "outdoors qualified") is the amp capacity of the cord.
I have a 3-wire cord rated for 15 amps, but it's a lot longer than 25 feet. Can I use it in this instance?