Hello everyone. I change my oil using the Nissan serere service OCI of 3750 miles. I realize that the Fram extra Guard oil filter will do this mileage just fine. What I want to know however is this.....does the Fram Tough Guard oil filter filter smaller particles than the Extra Guard thus offering better protection or does the Tough Guard simply hold more dirt allowing the filter to be changed less often? I just bought a Fram Tough Guard for my next oil change and am wondering if the Extra Guard would serve me just as well using a 3750 mile oil change. Thanks for the help.