I agree with @MFillingham . The filter won’t get blocked when not in use, so it’s all down to how many short (cold engine) trips you do between the long (hot engine) trips. Love BMW 3 series, X3s (last gen) and X5s, but with very little included as standard, the price soon rises with option packs, meaning the second hand market doesn’t have many with memory seats, adaptive cruise and to a lesser degree, 360cam. All the things I’m now used to.