In the 25K miles that we've had this 98SE, we've run the engine with 6 quarts of 5W-30 Valvoline and Motorcraft filters. Taking long, sweeping corners at high RPM's were always a no-no, but who knows what the previous 2 owners may have done.
Unless I receive some quick-fix advice, I'll be parting the vehicle out (MSDS, intake, MP3 player, etc.) and selling what's left to a salvage yard. I guess it's time to buy a GMC Yukon XL for the wife!
