History first. Vehicle is a 96 Ford Explorer, 4.0 OHV engine, 4WD Auto. Currently 186K miles.Oil and filter changes at 4 thou, STP or Fram filters until I saw here what junk Fram is. 10-30 summer, 5-30 winter Mobil regular oil. Changed the whole thing over to Amsoil syn products appropriate for the device. The engine was Amsoil engine flushed for 25 minutes with new filter per instructions. Installed an SDF15 filter and 5 qts. of 0-30 S2000 oil. Advice from this board says "ease into extended change" so I plan to do a filter replacement at 6K miles, top off with a quart and run another 6K. Do a UOA to check on oil/filter performance and to see if the OCI can be extended another 6K. Does this sound reasonable for a hi mileage vehicle in great shape? Any other tid-bits to help the change over? A few notes on "the change", tranny shifts MUCH better, engine is smoother, less noisy, and did NOT start to leak oil or add to the small front crankshaft leak it has had for years. Has not used a drop in 1500 miles. Can't testify to any great mileage increase, we now have the crappy winter gas and butt deep snow. So far I am impressed with Amsoil products and intend to do my 98 F150 when it warms up a tad. Thanks in advance.