Just changed the wife's Exploder over to Schaeffer's 5W-30 Blend. She has 30,000 miles on the Exploder and has run Motorcraft 5W-30 since new with changes @ 5,000 mile intervals. Initially changing @ 2,000 miles on the odometer and then @ the 5,000 mile odometer reading. Since the Schaeffer's will be run for 5,000 miles through part of the winter, the next 3-4 months, I'll do an analysis and if I get the go ahead from Terry I run the next interval for 7,500 miles. Especially since she will be out of warranty.