So I'm about to replace my fan clutch, belts, and bottom idler pulley. I have one of the new blue fan clutches from CDan. Is it really necessary for me to open up the new clutch and drain some old fluid and put in new thicker oil? I am just hesitant to crack open a brand new fan clutch, when apparently the old one lasted 100K. What do you all think? Also, I forgot to get the upper idler pulley, but the old one seems to spin fine (no bearings going by feel) but it does have a little bit of play in it, which I'm guessing is how it's designed. Or am I better off just replacing it?