I switched to Mobil 1 fully synthetic 5W-30 < http://www.mobil1.com/products/trisynth/oil_5w30.jsp > at 2550 miles, with a Mobil 1 M1-209 filter. Bought both at AutoZone, and don't remember what the oil cost, but the filter alone was ~$10.
I then changed to 10W-30 (still Mobil 1 fully synthetic, and Mobil 1 M1-209 filter) at 8840 miles for summer driving.
In the '91 Eagle Talon Turbo AWD I used to have, I ran Mobil 1 no problems, and only changed my oil and filter every 9-10k miles or so. I plan on doing the same with my '03 GT.
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JC Moore, \'03 Cranberry GT, a.k.a. \"Zippy\"
http://www.mooresmopars.com/GT-Cruiser/index-gt.html
Stage1, BTG Strut Bar, Sun Hyperground system, Prototype Power CAI, no silencers, Eibach ProKit, Borla 2.5\" SSTL single w/dual tip, APC 2G Carbon Fiber Taillights, Chrome Fuel door, \'02 foldaway heated mirrors, OEM-style rear spoiler, Progress 22mm rear sway bar, TYC backup lights, Magnecor 8.5mm, stock plugs, MB Design \"Shifter\" 17x7.5 wheels, Goodyear Eagle F1 GS-D3 235/45/ZR17 tires
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