Detroit DD16
Detroit's heavy-haul engine, sharing architecture with the DD15 at greater displacement. Sold almost entirely into Western Star and severe-service Freightliners.
Output
500-600 hp
1850-2050 lb-ft peak torque
Fuel per mile
$0.686
at 5.9 mpg and $4.049 a gallon
Fuel a year
$82,353
over 120,000 miles
In-frame overhaul
$27k-$39k
rough, and shop rates move it
In the exhaust
DPF and SCR, one-box
The first greenhouse gas phase targets the whole vehicle rather than the engine, so this era is as much about aerodynamics, tyres and axle ratios as combustion. Downspeeding becomes standard: tall gears, low cruise revs.
Known issues
The DD15's aftertreatment items, plus the weight and thirst that come with the displacement.
Verdict
Right for oversize and sustained grades. There is no reason to put one under a dry van.