I've searched far and wide even using oil filter cross reference website and clicking the alternative (wix 51036) filter that has a ton of alternatives. I was hoping to get a solid recommendation to replace my Amsoil eao23 that's coming off soon. I am disappointed with Amsoil filter QC recently and have decided they aren't what they used to be (ahem...WIX/MH!). I have also searched the Donaldson website using the attribute search for their automated recommendations and have only seen P550051 recommended (99% efficient at 45 microns). Is this the best I can hope for? TIA.