I've pretty much decided fram ultra are the best readily available filters for all my engines. My volvo penta 4.3gxi is no exception. I've been running an ultra xg30 with Chevron or Rotella 15w-40 hdeo oil. I'm getting ready to do an annual service to the engine. The engine logged 50 hours of moderate use. I've read the ultra are good for 20,000 miles. This one is probably no even broken in and the oil is still a dark amber color. Should I change the oil and reuse the filter or being on a marine application should I change the filter every time?