2005 Buick LaCrosse CXL 3800 Series III engine, 152,000 miles.
I just purchased this car to replace another '05 LaCrosse that was totaled in an accident.
Out: Unknown oil, very old AC Delco P47E; the oil itself did not look too dirty but the filter has been on there a long time.
In: STP Full Synthetic, 5W-30; filter STP 3387A; on sale at Advanced Auto.
The car shows no sign of any leaks or engine problems but needed a lot of suspension work, which is why the previous owner parted with it. That's all been corrected and the car drives wonderfully. Transmission shifts smoothly, fluid is still pinkish, I'll leave that alone for now. Coolant is Dexcool but looks reasonably fresh, the car had a new water pump installed four years ago so my guess is that the coolant was renewed then.
Since I don't know how long the car went between oil changes and that filter looked old, I'm going to only let this fill go to 3,000 miles or so. At that point I may switch to Pennzoil High Mileage, which worked really well with my wrecked LaCrosse, and will renew the coolant.