1st was 86 crown vic,sold at 150,000 miles. 2d 96 grand marquis. sold at 187,000 to friend , it now has over 250,000, is driven as primary car. Presently own 2003 G M 120,000 miles, all these cars have or had only routine maintiance. Better cars are built, they are built by Ford. Have always used Pennzoil either 5w 20 or 5w 30. I will hate to see the demise of this great car.