I'm stocking up on the "old" ultra filter's with the wire mesh, I've bought all the XG3387A's I can get locally (a total of 2). My 4.3 chevy can use the larger XG3980 and they are still available in the old Ultra's here. I'm running multiple oil changes on the filters but was concerned about the increased "old" oil in the larger filter. My engine holds 4.5 quarts, I'm thinking the larger filter holds 1/4 more oil.