AMSOIL, Mann, WIX, & Donaldsons Filters

2001, I began using AMSOIL oil and filters.  At that time they already had the first semi-synthetic oil filters (12.5K miles).  Not sure when it all started but this is best you could get until they made the first FULL synthetic oil filter (25k/one year).  Today most other brand have a synthetic blend concept.  Some like Mobil1 filters there are still a semi-syn filter.  Recently they all claim to all have gone to all 20k miles and still filter 20 microns @ 99%.  Without clogging or bypassing? For half the price?  Ya, right.  Read the fine print.  We are a true 25k filter (some cars are maxed out at 15k noted by the part # Ea15k13 if you get one) 

Adds a second Filter for many benefits!   Best for Diesel engines but also cars, tractors and mowers.  Decades ago these kits along with oil analysis started the "indefinite oil change.  Another first!