2017 Peterbilt 579 Oil Capacity & Filter

The 2017 Peterbilt 579 oil capacity varies significantly depending on the engine model installed.

Quick Answer

Because the Peterbilt 579 is a heavy-duty truck, engine options and their corresponding oil capacities are diverse. Consult your owner's manual or the engine manufacturer's specifications for precise details on your specific engine.

Capacity by Engine Option

The 2017 Peterbilt 579 was available with several engine options, primarily from PACCAR and Cummins. Each engine has a distinct oil capacity, recommended oil weight, and specifications.

Note: Always verify the specific oil capacity, weight, and specification for your truck's engine by checking the owner's manual or the engine manufacturer's documentation. Heavy-duty truck engines can have very large oil capacities, often ranging from 30 to over 50 quarts.

Oil Change Interval

Oil change intervals for a 2017 Peterbilt 579 are highly dependent on the engine, application (e.g., long-haul, vocational), and oil analysis results. Modern heavy-duty diesel engines often utilize oil life monitoring systems.

• Normal Duty: Typically ranges from 25,000 to 50,000 miles or 500-800 operating hours, whichever comes first.
• Severe Duty: Can be as low as 15,000 to 25,000 miles or 250-500 operating hours for applications like heavy hauling, excessive idling, or dusty environments.

Always refer to your engine manufacturer's recommendations and consider oil analysis for optimizing your oil change intervals.

Drain Plug Torque

Drain plug torque specifications vary by engine. Overtightening can strip threads, while undertightening can lead to leaks. Always use a new drain plug gasket or crush washer.

• PACCAR MX-13: Consult Owner's Manual / Service Information
• Cummins ISX15/X15: Consult Owner's Manual / Service Information

(Typically, heavy-duty engine drain plug torques can range from 30 lb-ft to over 60 lb-ft. Confirm with manufacturer data.)

How to Change the Oil

Changing the oil on a heavy-duty truck like the Peterbilt 579 is a more involved process than with a passenger car, often requiring specialized tools and facilities.

1. Warm up the engine: Drive the truck for a short period to bring the oil to operating temperature, ensuring it drains more easily.
2. Park on level ground: Engage the parking brake and chock the wheels for safety.
3. Locate the drain plug: Place a large oil pan (rated for the engine's capacity) beneath it.
4. Remove the drain plug: Carefully unscrew the drain plug, allowing the old oil to drain completely. Inspect the drain plug and replace the crush washer/gasket.
5. Replace the oil filter(s): Locate and remove the old oil filter(s). Apply a thin layer of new oil to the gasket of the new filter(s) and hand-tighten until snug, then turn an additional 1/2 to 3/4 turn (or as per filter manufacturer's instructions). Many heavy-duty engines use multiple filters.
6. Reinstall the drain plug: Torque to the manufacturer's specification.
7. Refill with new oil: Consult your manual for the exact capacity and slowly add the recommended type and amount of oil.
8. Check oil level: Start the engine and let it run for a few minutes, then shut it off and check the oil level on the dipstick. Top off if necessary.
9. Dispose of old oil: Properly dispose of used oil and filters at a certified recycling center.

Common Issues / Tips

• Oil Analysis: For fleet operators and owner-operators, regular oil analysis is crucial. It can extend drain intervals, identify potential engine issues early, and save significant costs.
• Genuine Filters: While aftermarket filters are available, many heavy-duty engine manufacturers recommend using OEM filters to ensure proper filtration and flow, protecting high-value engine components.
• DPF and Emissions Systems: The correct API CK-4 or FA-4 specification oil is vital for the longevity of Diesel Particulate Filters (DPF) and other emissions aftertreatment systems. Using incorrect oil can lead to premature clogging and costly repairs.
• Coolant Contamination: Keep an eye out for coolant in the oil (milky appearance) or oil in the coolant, which could indicate a serious engine issue like a failed oil cooler or head gasket.
• Fuel Dilution: Excessive fuel dilution in the oil can thin it out, reducing lubrication effectiveness. This is often detected through oil analysis and can be caused by malfunctioning injectors or DPF regeneration issues.

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