I pulled the filter bolt to check to see if I need to order new O-rings and found this. I have an "01" filter housing on an 84 300SD.
This bolt has an alum. (I assume) washer AND a huge upper o-ring but the bolt is much longer and has no groove for the large o-ring like the pics of the newer style bolt does. Anyone else have this bolt?? Could this have caused some problems? I dont see how it could unless the o-ring blocked the hole but it is a very tight fit and couldnt slide downward easy. Maybe this was an ok fix, or maybe someone was insane thinking this was ok?