I've never been a fan of the Detroit Diesel 6.2L engine that was so popular ... updating their 1982-vintage engine with later-model parts and then tossing on a Banks turbo system for good measure.

After Caterpillar stopped building on-highway engines in 2009, the main fight is between Detroit and Cummins when it comes to the best commercial diesel engines on the market currently.

Although they still exist, 2-stroke diesel engines aren't all that common, and 4-stroke engines are what you'll commonly see ...