Have new truck, 5.4 Ford F150. Changed oil at 500 miles to Mobil 1. Dealer tech advised to get rid of and use Ford %W-30 untill 10K miles because it would not seat in properly with the Mobil 1. Dumped the oil at 800 miles and refilled with Ford 5W30. Now have ticking noise at 1800 miles. Do not know if related, I plan to use Ford ffor a while and switch back to Mobil 1. How long should I wait?