- Engine
- 12,900 cc
- Power
- 455 hp
- Transmission
- Automatic
- Drive
- RWD
- Fuel
- Diesel
- Seats
- 2
PeterbiltLorry / Truck
5792012–present
Peterbilt's answer to the modern fleet spreadsheet — a strong highway tractor bought on records and spec, not romance.
- 🇺🇸 North America
- 🇦🇺 Australia & NZ
- Engine
- 12,900 cc
- Power
- 455 hp
- Transmission
- Automatic
- Drive
- RWD
- Fuel
- Diesel
- Seats
- 2
Overview
What this generation is, and who it suits.
The Peterbilt 579 is the brand's aerodynamic on-highway flagship — the fleet-focused Class 8 tractor designed around fuel efficiency, driver comfort and total cost of ownership rather than traditional styling. Launched in 2012 and substantially refreshed as the "Next Gen" mid-life, it offers PACCAR MX and Cummins power, automated transmissions, full aero packages and large, well-appointed sleepers, with an electric variant added for regional work.
It competes head-on with the Freightliner Cascadia and Kenworth T680 for fleet business, and the used market reflects that: supply is plentiful from fleet cycling, spec variation is wide, and value hinges on maintenance records, emissions-system health and remaining component warranties. Driver amenities in later trucks are a genuine strength. As with all US Class 8 tractors, it is left-hand drive and irrelevant to markets like Sri Lanka except as industry reference.
Pros & cons
What's good
- Strong aerodynamics and fuel economy focus
- Comfortable, well-appointed sleeper cabs
- Modern PACCAR powertrains with automated transmissions
- Plentiful used supply from fleet cycling
What to watch
- Emissions aftertreatment systems are costly when neglected
- Fleet-spec trucks can be austere and hard-worked
- Less traditional character than the 389 line
- North American LHD market only
Owner reviews
Written by people who have lived with this model.
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Trims & specs
One card per trim, with the spec spread across every year it was sold.
Frequently asked questions
What should I check on a used 579?
Aftertreatment and EGR system history, engine and transmission records, and any remaining PACCAR component coverage. Fleet trucks are usually maintained on schedule but worked constantly, so documentation is everything.
How does the Next Gen differ from earlier trucks?
The refreshed cab brought improved aerodynamics, a modernised digital dash and better driver ergonomics while keeping the same model identity. Later trucks command a premium that their efficiency gains partly repay.
PACCAR MX or Cummins power?
Both are well supported; the MX integrates tightly with PACCAR's warranty and dealer ecosystem, while Cummins offers familiarity and an enormous independent service network. Fleet preference and local support usually decide.
