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    Motorcraft Oil

    5w20 was spec'd by Ford for improved gas mileage but it may not protect as well as a good 5w30 or 10w30. Check out these guys http://theoildrop.server101.com/ubb/ultimatebb.php if you want to know more about oil. I wouldn't use anything above 30 weight for a newer Mustang. 15w40 might be OK for...
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