Hi everyone,kinda new here,been looking in here for a little while and am now full of questions,so I am starting now..What is the consensus on Mobil 1 filters..I recently switched over to Royale Purple 5w30 on my 03 Z71 and the wife's 03 Impala...Installed Mobil 1 filters and going for extended drain intervals 5-6 thousand..Should I change the filter half way or let it ride the whole 6k??? Thanks..