Factory oil
I believe the factory fill is a synthetic blend. haven't racked up enough miles for my first oil change yet, but I think the dealer will do a synthetic blend for their regular oil change on a 5 liter. don't quote me on that though.
amsoil calls for 100% synthetic:
http://www.amsoil.com/mygarage/vehic...FORD+MUSTANG+G
amsoil calls for 100% synthetic:
http://www.amsoil.com/mygarage/vehic...FORD+MUSTANG+G
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