Volvo D13
Volvo's mainstay, and with the I-Shift transmission and the turbo compound option one of the most fuel-efficient drivetrains sold. The integration between engine, gearbox and axle is Volvo's actual product.
Output
375-500 hp
1450-1850 lb-ft peak torque
Fuel per mile
$0.516
at 7.8 mpg and $4.049 a gallon
Fuel a year
$61,896
over 120,000 miles
In-frame overhaul
$21k-$31k
rough, and shop rates move it
In the exhaust
DPF and SCR
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
EGR cooler and valve, DEF dosing hardware, and on turbo compound units an extra assembly to go wrong in exchange for the fuel it saves.
Verdict
Buy the whole Volvo drivetrain or buy something else. The engine on its own is fine; the integration is where the economy comes from.
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