2018 Mack Anthem MP8 — Should You Buy One?
Typical asking price: $62,000–$90,000. There are 3 high-severity known issues you need to know before handing over a check.
Kestrel Take
Mack builds the most American semi truck on the market with their own MP8 engine and mDRIVE transmission. The MP8 is a proven workhorse that vocational and long-haul operators trust. The mDRIVE automated manual is reliable but has its own clutch and actuator wear concerns.
What we checked
Not checked against public records
No federal database covers this category in a form we can match to a single year and model. What follows is our own write-up, and it has not been reconciled against an official record. Treat it as a starting point, not a verdict.
Known Issues for the 2018 Mack Anthem MP8
Ranked by wallet impact. These are documented, recurring problems — not freak accidents. How we decide that.
Standard modern diesel aftertreatment concerns. Pre-purchase diagnostic scan is non-negotiable. Derate modes on a loaded truck are very expensive.
Repair cost (estimate): $500-$4,000
Source: not yet checked against public records.
The mDRIVE automated manual uses a clutch that wears and an actuator that can fail. Symptoms: difficulty finding gear, hard engagement, grinding. Clutch replacement on mDRIVE is expensive.
Repair cost (estimate): $3,000-$6,500
Source: not yet checked against public records.
EGR system failures on the MP8 — coolant loss from cooler failure, soot buildup from valve issues. Inspect coolant level and color.
Repair cost (estimate): $1,500-$4,000
Source: not yet checked against public records.
MP8 is sensitive to fuel quality. Contaminated diesel or water in fuel bypasses the filter and damages injectors. Ask about fuel filter change history.
Repair cost (estimate): $200-$5,000 depending on injector damage
Source: not yet checked against public records.
Walk-Away Red Flags
- ✗Active fault codes on pre-purchase ECM scan
- ✗mDRIVE hunting, grinding, or difficulty engaging
- ✗Coolant loss — EGR cooler failure likely
- ✗No fuel filter change records
Good Signs
- ✓Mack dealer PM service records
- ✓mDRIVE shifting smoothly with no hunting
- ✓ECM scan clean
- ✓Coolant system healthy with proper coolant color
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Known issues on this page are based on documented owner reports, NHTSA complaints, class-action records, and manufacturer technical service bulletins. Individual vehicles vary. A pre-purchase inspection by a trusted mechanic is always worth doing.
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