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Red Peterbilt 579 Ultraloft

Peterbilt Model 579 UltraLoft

The Peterbilt 579 UltraLoft combines advanced aerodynamics with premium comfort, featuring a spacious high-roof sleeper designed for long-haul efficiency. Engineered for performance and driver well-being, the UltraLoft delivers exceptional fuel economy without compromising on luxury or functionality. 

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PACCAR Parts & Service

PACCAR Parts and Peterbilt Service are at the ready at your local Peterbilt dealer. Shop here to get them in a hurry and get your business back on the road.

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EV or Diesel?

The Peterbilt Operating Costs Calculator helps you decide which configuration is best for your business.

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News

September 3, 2026

Peterbilt Trucks Equipped with PACCAR TX-18 Pro Boosts Efficiency for Maryland Fleet

Peterbilt Motors Company is delivering measurable fuel economy and payload improvements for vocational fleets operating the Peterbilt Model 567 and Model 5...

August 4, 2026

Peterbilt Expands Sourcewell Partnership with Electric Vehicle Lineup

Peterbilt Motors Company continues to expand its cooperative purchasing agreement with Sourcewell and its Canadian partner, Canoe Procurement Group, now in...

July 6, 2026

PACCAR Updates MX-11 and MX-13 Engine Software to enhance customer operations.

These changes are being made in alignment with EPA Guidance. PACCAR Inc. today announced that Peterbilt Motors Company and Kenworth Truck Company will impl...