I have a 97 Tbird with a 4.6 in it, I got the car about two months ago with about 112,000 miles on it so today about a 1000 miles later I did a oil change, I used 5 quarts of Castarol SAE40, and a Motocraft oil filter, can't remember the part# for that. I also added a small bottle of STP oil treatment. What do you guys think of this combo, also I live in the hot climate of Florida, with some nasty driving which includes few high rpms, and a lot of short distance driving. Looking forward to all the inputs. P.S right after the oil change I started the car and it sounded like bearing noise, but it quickly went away 2-3 seconds later.