PACCAR MX-13 Oil Capacity

PACCAR gives the MX-13 oil system capacity as 42 U.S. quarts on its EPA 2024 spec sheet, with an oil and filter interval that depends on idle time and duty.

Published: 2026-10-19

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PACCAR's MX-13 EPA 2024 specification sheet gives the oil system capacity as "42 U.S. QTS." The sheet does not break that figure down by oil pan. Confirm the capacity for the specific engine in the MX engine operator's manual before filling.

The figure and where it comes from

The MX-13 EPA 2024 specification sheet from PACCAR (form 2024MX13SPEC), published on peterbilt.com, lists "OIL SYSTEM CAPACITY 42 U.S. QTS." It applies to the EPA 2024 MX-13. An MX-13 certified to another emissions year has its own documentation.

How often is the oil changed on an MX-13?

The same sheet gives the oil and filter interval in miles (and kilometers) by duty:

Normal/Line Haul, under 20% idle time: 75,000 (120,000 km)
Normal/Line Haul, over 20% idle time: 50,000 (80,000 km)
Severe/Vocational Duty: 30,000 (48,000 km)

Idle time is part of how the sheet picks the interval, so a truck that idles a lot falls into a shorter one even on line haul. The sheet says to "Reference MX Engine Operators Manual for engine maintenance requirements."

Confirm it for your engine

Confirm the capacity, the oil specification and the interval for the engine's serial number and build in the MX engine operator's manual, or with a PACCAR engine dealer.

What should the service record show?

An MX-13 oil service record should show:

the date and the mileage or hours;
the duty and idle-time category the interval was based on;
the oil grade and the quantity added;
the filter part number;
the condition of the oil and filter that came out.

Log the oil service in Blue Collar Parts

The truck PM form's Engine Oil & Filter section records the service and what was found, and the finished visit becomes the record your customer receives.

This page states manufacturer specifications and is not a service manual. Confirm every figure for your engine's serial number and build against PACCAR's current service documentation before servicing it. Preventive maintenance is not a federal annual inspection and does not establish regulatory compliance.

See how a PM record is sent to your customer

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