I say run the Mobil 1 and leave it in for 6K or do what I do, run 5K change the fitler and add a quart and drive another 5K and then do a complete change. I was doing this before I talked to our resident Ford engineer Terry Haines and he told me thats what he does 
Roger R
SVT/SHO Society SE MI rep
2000 CSVT #1253 of 2150
silver frost/midnight blue
2-8" dark blue racing stripes
Mequiars...simply the best!
"...and number 5, now this is the most important Rat, when it comes to making out, whenever possible, put on side one of Led Zeppelin 4"
USMondeo@aol.com
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