I have been using them for several years now and found them to be the best filter made, today. For my 1972 MGB, it calls for a B243, and through working with the Baldwin Engineers, discovered and use a B2HPG filter which is ceramic, and filters at 5 microns, rather than the 20 to 40 microns. It is also a larger filter, which gives me a great capacity. Baldwin Filter also ownes Hastings Filter, and makes the filters for Amzoil. Baldwin is noted as the Heavy Duty Filter, and that they are - they also product racing filters.