2022 Peterbilt 579 Oil Capacity & Filter Guide

The 2022 Peterbilt 579 takes between 38 and 44 quarts (9.5 to 11 gallons) of engine oil, depending on whether it is equipped with a PACCAR MX-11, PACCAR MX-13, or Cummins X15 engine. As an ASE-certified heavy-duty technician, I cannot stress enough how critical proper lubrication maintenance is for these Class 8 haulers. Running long hours with heavy payloads means your engine oil is subjected to immense thermal and mechanical stress, making accurate oil levels and quality filters vital for longevity.

Quick answer

For the most common engine configuration, the PACCAR MX-13, here are the quick specifications:

• Oil Capacity: 40 quarts (10 gallons / 37.8 L) with filter change (varies slightly by oil pan option).
• Recommended Weight: 10W-30 (Standard factory fill) or 5W-30 for extreme cold climates.
• Oil Spec: API CK-4 or API FA-4 (check your specific engine data plate; FA-4 is designed for newer engines for better fuel economy, while CK-4 is backward compatible).
• Oil Filter OEM Part Number: PACCAR 2164053 (Cartridge style).
• Aftermarket Cross-References: Baldwin P40019, Wix 57161, Fleetguard LF16352 (Note: Standard automotive brands like Fram and Mobil 1 are rarely used in Class 8 applications; stick to heavy-duty filter specialists).

Capacity by engine option

The 2022 Peterbilt 579 is offered with three primary heavy-duty diesel engines. Capacities can vary based on the specific oil pan equipped for your chassis configuration, so always verify with your dipstick.

Note: The Cummins X15 may take up to 12 gallons (48 quarts) if equipped with a high-capacity oil pan. Always consult your truck's specific build sheet.

Oil change interval

Heavy-duty truck oil change intervals are heavily dependent on duty cycle, fuel economy (MPG), and idle time.

• Normal Duty (Long Haul / Linehaul): If you are averaging over 6.5 MPG and have low idle time (under 20%), PACCAR and Cummins recommend intervals between 60,000 and 75,000 miles.
• Severe Duty (Vocational / City / High Idle): For trucks doing frequent stops, heavy hauling, mountainous terrain, or experiencing high idle times, the interval drops significantly to 30,000 to 40,000 miles, or every 6 months. Engine hours are often a better metric for severe duty; aim for 600–800 hours.

Drain plug torque

• PACCAR MX Engines: The drain plug torque for the standard composite/plastic oil pan is 44 ft-lbs (60 Nm). Do not overtighten, or you risk cracking the pan.
• Cummins X15: The drain plug torque is typically 44 ft-lbs (60 Nm).
• Crush Washer Note: Always replace the copper or bonded seal ring on the drain plug. A heavy-duty engine vibrating down the highway will easily rattle a reused, flattened washer into a massive oil leak.

How to change the oil

Servicing a Class 8 truck requires heavy-duty equipment. Do not attempt this without a drain pan capable of holding at least 15 gallons.

1. Warm up the engine: Run the truck until the coolant temp reaches at least 140°F to suspend soot and allow the heavy oil to flow out quickly.
2. Position the catch pan: Place your large-capacity rolling drain pan beneath the oil pan.
3. Drain the oil: Remove the drain plug. Because you are dumping 10+ gallons, ensure your catch pan is properly vented so it doesn't overflow.
4. Remove the filter(s): For PACCAR engines, use the proper socket to remove the plastic cartridge cap. Replace the cartridge element and install the new O-ring on the cap, lubricating it with fresh oil. For Cummins, remove the spin-on filter (Fleetguard LF14000NN) and pre-fill the new filter with clean oil before installing.
5. Reinstall drain plug: Install a new crush washer and torque to 44 ft-lbs.
6. Refill and check: Pour in the specified quarts of oil (e.g., 10 gallons). Start the engine, watch for oil pressure to build on the dash gauge, and let it idle for two minutes. Shut it down, wait 10-15 minutes for the oil to return to the pan, and check the dipstick.

Common issues / tips

For this generation of the Peterbilt 579, particularly with the PACCAR MX-13, pay close attention to the centrifugal oil filter. PACCAR engines utilize a secondary centrifugal filter rotor housed on the side of the engine block to separate fine soot. This rotor must be replaced at every oil change to maintain engine health and prevent sludge buildup. Furthermore, do not overfill the crankcase; doing so can cause oil aeration, leading to decreased oil pressure and erratic operation of the engine's hydraulic components (like engine brakes).

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