I got 4 quarts of Mobil 1 5W30 Truck & SUV and I got 2 quarts of Mobil 1 5W30. It would be alright to mix these wouldn't it? The only difference I see is the Truck & SUV type can be used on the same engines as standard Mobil 1, PLUS diesel engines. Since its for harder working engines Id imagine it would be a little thicker and mixing different viscosities might be a factor. Not a motor oil specialist, sorry.
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