Do you own a 1979-1993 Foxbody Mustang? What Oil do you use? I have a 1991 LX Coupe 5.0 with 200,000 Kms a lot of bolt-ons, stock block, Stock Heads and cam, Explorer Intake, Full-length 1-5/8th Longtube headers, Electric Flex-A-Lite fan runs so cool, underdrive pulleys, 75mm mass air, 70 mm...