Hey Guys, How would I go about changing the hydro fluid in my 2002 LazerZ-HP 44 inch, 17 hp? I have the prescribed Mobil-1 and the $19.00!!! eXmark filter. I have a feeling ya don't want to get a whole lot of air in this system when changing the fluid so there must be a procedure for draining and filling and/or bleeding/purging air after it is filled. Thanks in advance for your assistance. R.S.