As engine platforms go, Cummins' ISX has to be considered slightly remarkable. It was introduced in 1998, although the program that brought the engine to life began in 1994.

It survived the transition to EGR and then to SCR aftertreatment -- while several other engines did not — and it's still very much alive and kicking today.

We spent a day in February test-driving a couple of production-intent versions of the 2017 X15 — and a current, 2016 ISX15 engine for comparison.

In Part 1 of our three-part Focus On... video series, we highlight some of the current features of the 2016 engine, those included in the Adept Technology Suite. Cummins will be building upon these features and others with the mid-July launch of the 2017 version of the engine. We'll have a full rundown of that in Part 2 of the series. Stay tuned.

In the meantime, check out what this nearly 20-year-old engine platform is capable of, and know that what's around the corner in 2017 is even more impressive. I know. I've already driven one.