What is a Ford Duratec engine?

Duratec is a brand name of the Ford Motor Company used for the company's range of gasoline-powered four-cylinder, five-cylinder and six-cylinder passenger car engines. The original 1993 Duratec V6 engine was designed by Ford and Porsche.

Lot more interesting detail can be read here. Herein, is the Ford Duratec engine reliable?

Engine life of Duratec HE 2.0 is about 220,000 miles, but in practice, you can find cars equipped with that engine which has mileage more than 350,000 miles. The new Duratec HE GDI Ti-VCT replaced this engine in 2010. But we will remember the Duratec 2.0 engine as reliable, durable, the best of all Duratec engines.

Beside above, do Mazda use Ford engines? Mazda does not plan to share its new engine technology with Ford."

Just so, are Ford 3.0 v6 a reliable engine?

on a properly maintained 3.0, they are not a problem. the cam syncro is a vulnerable spot for any '95+but is easily monitored/replaced. the 3.0 is about as reliable as they come. over 300,000 miles isnt uncommon.

How much horsepower does a 3.0 v6 have?

It has 3.0 L (2,967 cc) of displacement and produces between 200 hp (149 kW) and 240 hp (179 kW).