I run Mobil 1 non-synthetic in my stock motor with a Motorcraft filter. In the summer I run 10w-40 and in the winter I run 5w-30. My car hardly leaked in the summer, now I can't leave it alone for 30 seconds without oil dripping out of it. I'd definately go with 10w-40 for your application. ~Brian
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1989 Black Mustang GT Hatchback, Underdrive Pulles, Electric Fan, Cold Air Intake, Headers, Offroad H-Pipe, Magnaflow catback, Steeda Tri-Ax, Fluidyne Aluminum Radiator, Timing at 14*, 3.73's
Coming not so soon: 408w
Ricer Hater's Club Member #59
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