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I had a 97 GTP as well, with just a 3.4" pulley and a 9" cone K&N filter (instead of the very restrictive stock airbox) it ran 13.78 at 100mph! (on all season radials too) That car was a lot of fun actually, I used to surprise the heck out of 5.0 Mustangs all the time. They'd never expect this bone stock looking four door family car to run so quick.
I ran Mobil 1 5w30 in the winter, and Mobil 1 10w30 the rest of the time in it. I wasn't doing UOAs back then though. I did change the blower oil once and bond007 is right, that stuff smells nasty!
