It has the LT1 engine and it appears the passage of time has not been so kind to the car. The rear main seal might be on the way out as there is oily residue in the area but no drips. Oil cooler lines are also leaking but that's a cheap fix. From what I know this car has done almost nothing but short trips for almost 20 years in Arizona's typical climate and it has been parked infrequently. I daily drive it 10 miles one way in moderate stop and go traffic. Currently it has the Pennzoil 5W-30 Dexos1 synthetic blend in it with a Bosch Premium filter. I have no brand preferences and budget is generous but I'd like to try Rotella T5 or Motorcraft 10W-30 when the time comes. Maybe a synthetic in the future too when I fix up the seals. Are there any LT1 owners who could chime in??