No idea what the oil burners require I am referencing the gasoline engines in NA. The diesels sound like maintenance heavy problem childs. A proper filter for the 5.0L is close to $50-60 Cdn so the cost is close to 50% of the oil change for me. IMO the largest risk to the LR4 5.0L is fuel dilution due to the DI setup, especially in cold climates. In addition used oil being pushed through the PCV and coating the deep intake tract and the backside of the intake valves is a recipe for increased carbonization. A new filter won't protect against this but changing out oil will. Will oil outlast a filter? who knows but Amsoil is now making a filter rated for 25 000 miles...I thought Fram was crazy at 24 000 kms. Remember a new filter does not filter any better than an old one. It is only if the old filter plugs and goes into bypass. My experience is that a filter run for a full year is now where close to "plugged". If it is you have other issues. The risk of media failure is a real concern but I think this is mitigated by buying quality filters and inspecting them very carefully before installation.