Nick you need not required to do flushing. just heat up the engine, open the filler cap and drain for 30min thats it. Shift to mobil 1 but change it after 10 k, after that you can easily run your engine for atleast 15k (max 20k)on mobil 1. But make sure during that period you change the filters and other lubricants according to the owners manual, better go in for the best of coolant, gear oil and brake oil to get the best out of your car.