Q1: I am wondering how powerful a scope one would need to view an area about 4 miles away.

A: The amount of magnification needed to see distant objects depends on the amount of detail you want to see. A car 4 miles away would appear to be only about 130 yards distant with a spotting scope offering 60X magnification. At that distance, you would be able to determine make, model and color, but you'd not be able to read the license plate. The Zhumell 20-60x80 Spotting Scope would offer this level of power. Here's the URL; just paste it into your browser's address window to see the scope: http://www.spottingscopes.com/products/Zhumell_20-60x80mm_Angled_Spotting_Scope_36559.html. If additional power is desired, a scope like the Zhumell 30-90x118mm Angled Spotting Scope would bring the same car to within about 80 yards. Here's the URL: http://www.spottingscopes.com/products/Zhumell_30-90x118mm_Angled_Spotting_Scope_31287.html.

Q2: is this scope fully waterproof and dustproof- celestron ultima 80 20-60x80?

A: Yes, the Celestron Ultima 20-60x80 Ultima is fully waterproof.

Q3: where are the celestron ultima 20-60x100 made?

A: Celestron Ultima 20-60x80 Spotting Scopes are made in China.