buddy of mine recently (few months ago) bought a 2007 Grand Marquis, unsure of the mileage. its an extreme short tripper. He and his mom work at the same place, its right up the street from where they live. His mom has knee problems, so instead of walking they take the car. Its about 200 feet up the street, take a left and theyre at work. once in the morning, once for lunch, then again to go home. I told him to take it on a good long run every once in a while. What would be the best oil/filter combo for this situation? i was thinking PU 5W20 and a MC FL820S every 4 months? he does take it on a 80 mile round trip every other weekend but besides that, its short trip duty, 5 days a week.