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Hello, I will do my best to answer your questions. The oil won't make a difference between 5w20 and 5w30 for the way the engine runs. The ticking noise of some sort is usually considered normal on these engines. excessive ticking isn't though. The Ford warranty should be 3 years 100k miles. This should still be under warranty isn't it?
why the oil weight changed was just an engineering idea. If a new engineer comes in and likes a different oil then they will change it. It won't affect longevity of the motor. I find it off you have had to engine failures because they don't have alot of issues. They have been reliable some with 500k miles. what intervals are you changing your oil? does this vehicle idle alot?