10. The Ford Shelby Mustang GT350 is one of the hottest pony cars to reach production in recent memory. At its heart is a snarling 5.2-liter, 526-horsepower V8 engine known as the "Voodoo."
9. The 3.6-liter LGX V6 engine is the first of two power plants from General Motors to make the list this year. According to Wards, the 335-horsepower, fuel-efficient V6 proves that the six-banger is no longer just a consolation prize for missing out on the V8.
8. The second entry from GM is the 1.5-liter inline four-cylinder and hybrid-electric system from the Chevrolet Volt.
7. Wards was also highly impressed by the hybrid system on the Hyundai Sonata PHEV. The hybrid sedan returned 41 mpg to 80 mpg of fuel economy during testing.
6. You can't talk about hybrids without mentioning the Toyota Prius. This year, the Prius returns to the winner's circle for a fourth time.
5. The Ram 1500's 3.0-liter, EcoDiesel V6 engine is the first of two holdovers from last year's winners. In fact, this is the EcoDiesel's third win in a row.
4. The other returning winner from 2015 is Subaru's potent 2.0-liter, 268-horsepower, turbocharged boxer four-cylinder.
3. Last year, Volvo's 2.0-liter, 240-horsepower turbocharged Drive-E engine took home one of Wards' trophies. This year, Volvo's Drive-E is back with a turbocharger and a supercharger.
2. Nissan's VQ Series V6 engine returns to Wards' top-10 list. With the latest variant from the new Maxima, the venerable engine makes its 15th appearance on the list since 1995.
1. Finally, there's BMW's new B58 3.0-liter, inline six-cylinder. This is BMW's 32nd trophy in the competition in 22 years.