i have an 06 rangertrail,with the cool hubs,im gonna change the oil this weekend,one question is how full do you refill,i see alot of post that say fill to top ,with no air bubbles,but my quwstion being is,the clear caps have 2 marks about 1/2 up way that say min fill level and max fill level right now they are in between,so wich is it ? thanks in advance