That's interesting. My owners manual gave the quantity as 6.4, sounds like a rounding error--or Chrysler decided that 6.3 was safer. And, while I got the label "Max" wrong (I did this from memory), either way, if you fill it to the top mark, the engine will promptly spit it out. I'll try 6.3 at the next oil change, right now, I get a little oil out of the Provent at each change--I would estimate this oil quantity at 1/4 cup or 2 fl oz.