Most definitely safe to run! A friend of mine bought a 96GT brand new and ran nothing but Mobil 1 10w30 in it, even after he put on a Vortech blower. He just sold that car and bought a rare Pacific Green 97 Cobra vert, and runs 10w30 Mobil 1 in that one too. IMO, 5w30 oil has no business in a high performance engine, 10w30 is the better choice. It won't thin out as easily as 5w30 does.