I have a 2005 Monte Carlo with a 3.4 L V-6. It has developed a lifter that partially collapses while shut down. When I tool it to the GM dealer for repairs they told me that the warrenty would not cover it because I was using a NAPA gold filter instead of a GM filter. From what I can find out the NAPA made by Wix is one of the top rated filters on the market.So what's the deal here on the extended warrenty?