What is the PACCAR MX-13?
PACCAR identifies its EPA MX-13 as a 12.9 L engine. The MX-13 designation spans model years, so the current product page should be read alongside the serial-number and year-specific documentation for a used truck. Its heavy-duty role differs from the PX medium-duty family.
What matters in a comparison
For an MX-13 tractor, evaluate the installed engine rating together with transmission model, axle ratio and usual loads. Request maintenance and aftertreatment records for the actual engine. When comparing it with an MX-11 or a different brand, use the same truck role and operating assumptions. Published maximum power and claimed efficiency improvements are not a complete cost comparison.
Fluids & filters
MX engines: EPA17/EPA21/EPA24 oil approval chart; coolant examples from the 2024 MX manual. Filter numbers below are conditional catalogue matches, not parts assigned to that manual year.
Reference checked:
Identify the unit first
Use these details to match the manufacturer's application record before choosing a fluid or ordering a filter.
- Truck VIN
- Engine model and serial number
- Engine emissions/model year
- Installed filter-housing model and original part number
- Factory coolant label and subsequent coolant-change records
Fluid specifications
Engine oil
API CK-4 heavy-duty oil; SAE 10W-30 is the normal-operation recommendation.
EPA17/EPA21/EPA24 MX approval chart and the cited model manual. Normal 10W-30 guidance assumes ambient temperature above −15°C; use the model-year climate chart for colder conditions and biodiesel restrictions.
Source 1 ↗ Source 2 ↗Engine coolant — nitrited ELC fill
NOAT extended-life coolant meeting ASTM D6210 and PACCAR MAT74002; the standard factory mix is 50/50 unless otherwise optioned.
2024 MX manual identifies this specification for MX-11/MX-13. Confirm the installed coolant label; OAT and NOAT are separate selections.
Source 1 ↗Engine coolant — nitrite-free alternative
Nitrite-free OAT meeting DAF 74002.
Only where the applicable MX manual and installed coolant selection authorize this formulation. Follow the coolant maker’s dilution/changeover instructions; do not add ELC extender to nitrite-free coolant.
Source 1 ↗Filter numbers & cross-references
A catalogue cross-reference links part numbers. It does not confirm that either part fits every version of this model. Match the original part to the unit first, then check the replacement manufacturer's application and any supersession.
Engine oil filter — exact-number cross-reference
First identify this exact original part through the OEM lookup for your engine serial number and VIN. Catalogue lists this in the MX-11/MX-13 family; different oil-filter arrangements also exist. The catalogue cross-reference alone does not confirm fitment on every engine in this family.
Application not established by this cross-reference. Confirm this original part number in the manufacturer’s parts catalogue for the exact model and serial number before considering an alternate.
Source 1 ↗Manufacturer catalogue cross-references
- Donaldson P550812Check catalogue ↗
Fuel filter — exact-number cross-reference
First identify this exact original part through the OEM lookup for your engine serial number and VIN. Catalogue lists this as the MX secondary fuel-filter number; confirm exact emissions year and housing. The catalogue cross-reference alone does not confirm fitment on every engine in this family.
Application not established by this cross-reference. Confirm this original part number in the manufacturer’s parts catalogue for the exact model and serial number before considering an alternate.
Source 1 ↗Manufacturer catalogue cross-references
- Donaldson P551004Check catalogue ↗
PACCAR Parts — Online Parts Counter through your dealer ↗
PACCAR engine manuals by model and emissions year ↗
What still needs unit-specific confirmation
- Confirm current part supersessions and vehicle-specific fitment through the OEM before ordering. Quantities, capacities and maintenance intervals require the serial-specific manual.
Official service and parts references
Source 1 ↗ Source 2 ↗ Source 3 ↗ Source 4 ↗ Source 5 ↗ Source 6 ↗Follow the current manufacturer's manual for the identified unit. This page does not set a drain interval, fill quantity or repair procedure.
Questions to take to the supplier
- Which MX-13 generation and rating are installed?
- Does the service history match the engine serial number?
- What gearing and route underlie the fuel assumption?
Sources & limits
Manufacturer material supports the identification and overview above. Comparison considerations and supplier questions are Truck University’s original editorial interpretation, prepared with AI assistance. They are not an independent performance test or expert inspection.
Model-family reference only. Availability, specifications and service requirements can differ by year, market and configuration. Verify the actual vehicle or component using its identification and current manufacturer documentation. Do not use this page as a parts-fitment, modification, repair or loading instruction.
Published specifications and examples retain their labelled units; the header preferences apply to calculators.
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