I took out the filler plug on passengers side while cold and thought I should fill till it started to drain out. It never drained. What concerns me is I put in about 1.5 quarts. 1 quart more than it calls for. Any bad reason why it never over flowed if it only takes 1.5 pints? I drove the truck today without any issues. The reason I filled it is because I get a stain in the garage about the size of a 50 cent piece every time after parking. Been since 8/2011 so I thought it time to top it off.