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.
Known Issues for the 2018 Mack Anthem MP8
Ranked by wallet impact. These are documented, recurring problems — not freak accidents.
Standard modern diesel aftertreatment concerns. Pre-purchase diagnostic scan is non-negotiable. Derate modes on a loaded truck are very expensive.
Repair cost range: $500-$4,000
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 range: $3,000-$6,500
EGR system failures on the MP8 — coolant loss from cooler failure, soot buildup from valve issues. Inspect coolant level and color.
Repair cost range: $1,500-$4,000
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 range: $200-$5,000 depending on injector damage
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
Found a specific Mack Anthem MP8?
This page covers what goes wrong on the 2018 Mack Anthem MP8 in general. The Kestrel report covers this specific car— the asking price vs. market, the photos, the seller's description, and a BUY / NEGOTIATE / WALK AWAY verdict with a negotiation script.
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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.