I can't remember..............the engine oil filter for a 16 hp Vanguard V-twin............what does the Cub filter equate to in other filters? I think it's an AC P51 or P52. It takes the same filter as the old 2.2 Chrysler that was in the K-Cars. I just can't remember which one. I know the AC is a good deal cheaper than the Cub brand.