Paccar MX-13 vs Detroit DD13
Two used heavy truck diesel engine options, compared on the numbers that decide it: used price, the failure that costs the most, and recall exposure. Every figure links back to its sourced record.
| Paccar MX-13 | Detroit DD13 | |
|---|---|---|
| Used price (observed) | Priced by repair part (see page) | Priced by repair part (see page) |
| Category | heavy truck diesel engine | heavy truck diesel engine |
| Top documented risk | EGR cooler (high) | One-box aftertreatment (ACM / DPF-SCR) (high) |
| Recall status | None found | Recall on record — check serial |
| Our verdict | inspect | inspect |
| Full record | MX-13 details → | DD13 details → |
The bottom line
Paccar MX-13: A capable Paccar engine, but the emissions hardware is where the money goes: budget an EGR cooler at $2,200–$2,800, a turbocharger at $3,500–$4,500 (incl. labor), and an eventual DPF replacement at $4,000–$6,000, with injectors $400–$800 each. Inspect the aftertreatment and injector history before buying.
Detroit DD13: A 2010+ engine that "complies with EPA, CARB emissions, GHG, and OBD requirements" — the clean California-legal contrast to a pre-2010 Cat C15 or Series 60. Watch the shared Detroit one-box aftertreatment (ACM $1,800–$2,400, one-box $4,000–$6,000 on the DD15 sibling) and confirmed DD13-named Bosch fuel-pump / fuel-line recalls.
Both records show every price, failure mode and recall check with the source. Open the full record for the inspection checklist before you buy: Paccar MX-13 · Detroit DD13.