Hi guys,im running Motorcraft 5w20 in my grand marquis at 5,000 intervals. I am using the car for my job as a Private driver and car sits idling for 2,3 hrs. at a time 3 or 4 times a week. Based on this,what oil and interval would you suggest? Car has 23,000 miles,no consumption. 2004 Grand Marquis. Hope everyone is doing well. Thanks for any advice.