Nitrogen /air in tires

brackleybeach wrote:
It's Ok to mix summer air with nitrogen but if you have winter air in the tires then you have to make sure it is all removed before adding nitrogen.

Or buy that Australian air. Their seasons are reversed. Of course, if you use Australian air you have to put the left tires on the right side and vice versa. Else the air will rotate in the wrong direction and damage the muffler bearings.