Hey guys. I currently have an Amsoil oil filter on my boat, with amsoil oil. It is getting near time to winterize, and I was going to use a PureOne filter on it because they are $6.50, show to filter very good, and since it is a boat, it is not like I am putting 15k miles on the engine every year. Now, I was visiting the newer Walmart by my house (not my normal WM, this one is a little further) and I see that they carry the Mobil 1 filter for about $8.00. Now, do I just go with my first idea of running the PO, or spend another $1.50 and get the M1?? I read somewhere that the M1 is rated at a higher micron level. My main concern is filtration, not extended life because it is a boat. BTW,this is a FL1A style filter.