I have an 89 Dodge Raider (Mitsubishi Montero) 3.0L V6 that just turned 200K. I've been using Castrol 10-40 and Fram filters every 2500 miles. It uses about a quart between changes. I'll be spending half a year at a time in Australia and my auto will live with my son and be used sparingly while I'm gone. I thought that maybe switching to Amsoil and doing two filter changes a year and one oil change a year might make sense. Does it? Thanks!