What's the largest filter that will physically fit on a GM LSA engine? Factory filter is the AC Delco PF48 and I know that the AC Delco PF63 filter with work just fine with no clearance issues. AC Delco and GM lube Engineers states that the PF63 is fine to use in any application that calls for a PF48 filter. Is there an even longer AC Delco filter I can safely run that will physically fit without the filter hanging down past the oil pan. There seems to be plenty of room to run a 5" to 6" filter without any clearance issues. My 2014 CTS-V calls for a Fram Ultra XG 10060 filter (AC Delco PF48 equivalent), but I picked up some Fram Ultra XG 10575 (AC Delco PF63 equivalent.) I was wondering what is the largest Fram Ultra filter I can run that will physically fit and safely run without the filter hanging down past the oil pan. The XG 10575 while being bigger than the XG 10060 still seems smaller than the AC Delco PF63 filter. Anyone know any info?