I have the old 5 digit Bosch oil filter numbers that have been mentioned on the list in the past. Has Bosch changed their numbering system. I went to the local Autozone, and all of their filters had a four digit number. The guy told me the numbers had changed. I want to make sure I get the right filter. Also, they have the Mobil 1 filters. Has anyone ever used one of these on their DeLorean? I know their oil is excellent, but I'm wondering how good their filters are. Brian VIN 1597