PACCAR MX-13
PACCAR's own engine, built on DAF architecture, and now the default in a large share of new Kenworths and Peterbilts. Compact graphite iron block, lighter than a 15 litre, and competitive on fuel with the Detroit.
Output
405-510 hp
1450-1850 lb-ft peak torque
Fuel per mile
$0.533
at 7.6 mpg and $4.049 a gallon
Fuel a year
$63,932
over 120,000 miles
In-frame overhaul
$21k-$30k
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 valve and cooler, aftertreatment sensors, and a parts channel that runs through PACCAR dealers rather than the independent network, which matters when you break down somewhere without one.
Verdict
A good engine with a real logistics caveat: check where the nearest PACCAR dealer is on the lanes you actually run before you choose it over a Cummins.
Trucks it is offered in
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