1. I have been idling my car a lot and sometimes used the cheapest gas from some no-name gas stations.

Exauhst parts can heat and cool dramatically from working to ideling causing the cooldown "tick".

2. When my 5w20 Motocraft oil gets warm it gets thick and then it is somehow causing this sound.

Oil becomes "thinner" with heat. Lifter noise can happen because of this but thats typically very regular and the speed of the tick the directly related to the engine speed. Although volume is usealy steady or loweres with higher engine speed.

3. There is just something wrong with the engine.

Engines make noise. It may also be normal. If you can narrow down a location I may have more suggestions.

1. I have been idling my car a lot and sometimes used the cheapest gas from some no-name gas stations.

Exhaust parts can heat and cool dramatically from working to idling causing the cool-down "tick".

2. When my 5w20 Motocraft oil gets warm it gets thick and then it is somehow causing this sound.

Oil becomes "thinner" with heat. Lifter noise can happen because of this but that's typically very regular and the speed of the tick the directly related to the engine speed. Although volume is usually steady or lowers with higher engine speed.

3. There is just something wrong with the engine.

Engines make noise. It may also be normal. If you can narrow down a location I may have more suggestions.