Hello... I'm reaching decision time on what my next oil should be..(for 4.6L sohc T-bird, 96k miles) I now have 3,600 miles on the GC, and I'm going to do an UOA with Terry Dyson package next week. So far, 0.75 qt of GC has been added. I'm still undecided about using GC further, or changing it to M-1 5w/40...been eyeing this ever since it showed up at WalMart...the GC has been good so far..in warm weather. It's also the 1st oil after the Arx rinse with Chevr.supreme. I've won a Free oil change at my trustworthy Ford dealer, so I think I'll use it, and ask him to get a sample..but what should go in as the next oil?? What do you guys think? How would the Mobil-1 Truck/suv perform in this engine? especially concerning summer and consumption.?if the GC uoa results are good, I can always go back to it after the M-1... Also, I'll be moving to N.Carolina in 2 months, and i don't know if I can find any GC there...M-1 seems to be available in WMart almost anywhere. any advice/ideas? Thanks.