I got a 4.0 that hydrolocked from injectors stuck open what happens is after realizing smoke in the exhaust and turning it off then cranking one time after locks motor. Remove intake completely full of fuel. Changed all injectors and spark plugs then back on the road. **** happens.but even then it would be the water in the applejuice that would actually cause teh damage. Since gas doesnt have water in it, then no, you cant "petrolock" the motor. I would say the worst that can happen is detonation. Which is still pretty bad...