Ticking noise

2001, 50,000 miles. On start up, my engine makes a very noticeable ticking/tapping noise. It goes away after about 30 seconds and the truck has always run great.
The shop said that if I'd ever had anything but 5/20 oil in it, it would cause damage to the valve train. I bought the car used and have always put 5/20 in it. Shop says there's a TSB on this, but darned if I can find it. Anyone ever heard of this? There's 15K miles left on my warranty. Any help appreciated!

There has been much debate on oil selection for the Escape. I know that Ford recommends the 5w20, but they only do it to get a better fuel economy rating. The wear characteristics for 5w20 oil are not very good. I have been running 5w30 and 0w30 (winter) synthetic oil in my 2001 escape for over 100k with no problems. The engine is as quiet as the day I bought it.

Complain some more about the engine noise that isn't normal, the dealers usually love warranty work. It is no skin off their backs.

cam noise has been pretty common. they take off the rocker and retorque the cams.

Try using a motocraft oil filter. My mom had the same problem & mechanic told her her to use that filter. Then problem went away.