I have a 1990 Thunderbird Super Coupe that just rolled over to 100,000 miles a few weeks ago. It is a supercharged Ford 3.8L V6, running 15 PSI boost. I'll be due for an oil change in a few weeks, I'm currently debating between Maxlife Synthetic 5W-30 and Penzoil Platinum 5W-30. Price isn't really a big deal to me because synthetic is only 6 more dollars for 5 quarts than regular oil and 3000 miles will take me at least 4 months. I drive 9 miles to work each way, most of which is rural and highway. I occasionally take the car up to the drag strip making WOT 1/4 mile runs, which the car is running pretty hot. Recommendations are wanted! Thanks.