Western Star Engine Oil Capacity Chart(For All Models)

Using the right amount of oil helps prevent engine wear, overheating, and long-term mechanical issues.

In this post, we present a comprehensive oil capacity chart for Western Star trucks, organized by engine type and model year. This guide includes all major engines used in Western Star trucks including Detroit Diesel, Cummins, and Caterpillar.

Western Star Engine Oil Capacity Chart

Model	Engine	Model Years	Oil Capacity (Liters)	Oil Capacity (Quarts)
Western Star 4700	Cummins ISB 6.7L	2012–2016	15	15.9
Western Star 4700	Cummins B6.7	2017–present	15	15.9
Western Star 4700	Detroit DD13	2012–present	38	40
Western Star 4700	Cummins L9	2017–present	26.5	28
Western Star 4800	Detroit DD13	2010–present	38	40
Western Star 4800	Cummins ISC 8.3L	2000–2010	24	25.4
Western Star 4800	Cummins X12	2018–present	34	36
Western Star 4800	Detroit Series 60 12.7L	1990s–2007	37.8	40
Western Star 4900	Cummins ISM 11L	2000–2009	37	39
Western Star 4900	Cummins N14	1990s–2002	37.8	40
Western Star 4900	CAT 3406E	1995–2003	38	40
Western Star 4900	Detroit Series 60 11.1L	1993–2000	34	36
Western Star 4900	Detroit DD15	2007–present	41.6	44
Western Star 4900	Cummins X15	2018–present	45.4	48
Western Star 4900	CAT C12	1998–2007	34	36
Western Star 4900	Mercedes-Benz MBE4000	2003–2010	34	36
Western Star 5700XE	Detroit DD16	2015–2022	49	51.8
Western Star 5700XE	Detroit DD15	2015–2022	41.6	44
Western Star 5700XE	Detroit DD13	2015–2022	38	40
Western Star 57X	Detroit DD13 Gen 5	2023–present	38	40
Western Star 57X	Detroit DD15 Gen 5	2023–present	45	47.5
Western Star 57X	Detroit DD16 Gen 5	2023–present	49	51.8
Western Star 6900XD	Detroit Series 60 14L	2001–2011	42	44.4
Western Star 6900XD	Cummins QSX15	2005–2011	45.4	48
Western Star 6900XD	MTU 12V 4000 (special use export)	N/A	55–60	58–63
Western Star 6900XD	CAT C16	2000–2007	44	46.5
Western Star 5964SS	Detroit Series 60 12.7L	1990s	37.8	40
Western Star 5964SS	CAT 3406C	1980s–1990s	38	40
Western Star 4964EX	CAT C15 ACERT	2005–2010	41.6	44
Western Star 4964EX	Cummins ISX 15.0L	2004–2010	45.4	48
Western Star Constellation	Cummins Signature 600	1999–2006 (AUS/NZ)	44	46.5
Western Star Constellation	Detroit Series 60 14L	1999–2006 (AUS/NZ)	42	44.4
Western Star 47X	Detroit DD13	2021–present	38	40
Western Star 47X	Cummins L9	2021–present	26.5	28
Western Star 49X	Detroit DD13	2021–present	38	40
Western Star 49X	Detroit DD16	2021–present	49	51.8
Western Star 49X	Cummins X15	2021–present	45.4	48
Western Star 4964F	CAT 3406B	1980s–1990s	38	40
Western Star 4800SB	Detroit DD13	2010–present	38	40
Western Star 4800SB	Cummins X12	2018–present	34	36

Note:

Oil capacity can vary slightly based on oil cooler configurations, filters used, and sump design.

Always check the engine plate and OEM service manual for exact specs for your truck.

For trucks operating in extreme climates or with extended oil drain intervals, synthetic oils with high TBN (Total Base Number) ratings are recommended.

Engine Oil Tips for Western Star Owners

1. Use the Manufacturer-Recommended Oil

Always refer to the engine manufacturer’s guide (e.g., Detroit, Cummins, or CAT) to ensure you are using the correct viscosity (e.g., 15W-40 or 10W-30) and oil specifications, such as API CK-4 or FA-4.

2. Change Intervals Matter

While oil capacity is important, so is oil change frequency. For modern engines using synthetic oil, change intervals range from 25,000 to 50,000 miles depending on duty cycles and operating conditions. Use oil analysis for precision.

3. Don’t Rely on the Dipstick Alone

When refilling oil, always measure how much you’re adding. The dipstick may not give accurate readings right away. Allow the oil to settle before checking.

4. Watch for Oil Consumption

Heavy-duty diesel engines may consume oil over long distances. Keep an eye on levels during long hauls and top up as needed.

5. Monitor Oil Temperature and Pressure

Advanced diagnostics in newer Western Star models can help monitor oil pressure and temperature. Abnormal readings may signal oil flow issues or degraded oil quality.

FAQs

What kind of oil does a Western Star 4700 take?

The type of oil a Western Star 4700 takes depends on the engine. For example, a Detroit DD13 typically uses 15W-40 API CK-4 engine oil, while Cummins engines like the ISL9 may use either 15W-40 or 10W-30 depending on operating temperatures.

How much oil does a Western Star 4700 AC unit take?

The AC system oil capacity in a Western Star 4700 generally ranges from 8 to 11 ounces of PAG 100 or PAG 46 refrigerant oil, depending on the compressor model and system configuration. It’s best to check the label under the hood or refer to the service manual for exact capacity.

How much oil does a Western Star AC compressor hold?

Most Western Star AC compressors hold between 6 to 10 ounces of refrigerant oil, typically PAG 100 or PAG 46. The exact amount depends on the compressor type and system design. If replacing the compressor, ensure to match the oil quantity with OEM specs.

How often should I change my AC compressor oil?

AC compressor oil should be changed whenever a new compressor is installed or if the system is opened for major repairs. It is not part of routine maintenance unless there’s a component failure or contamination. Regular AC servicing, however, should include a check of oil and refrigerant levels.

How much oil does an International 7400 take?

The oil capacity of an International 7400 truck depends on its engine. For example, a MaxxForce DT engine typically holds around 24–28 quarts (22.7–26.5 liters) of engine oil. Verify with the specific engine configuration for accuracy.

How much horsepower does a Western Star 4700 have?

The Western Star 4700’s horsepower ranges from 260 to 470 hp, depending on the engine installed. For instance, a Cummins L9 may produce up to 380 hp, while a Detroit DD13 can go as high as 470 hp. The exact figure depends on the model year and engine configuration.

How much freon does a Western Star 4900 take?

The Western Star 4900 AC system typically holds between 3.5 to 4.5 pounds of R-134a refrigerant. Always consult the sticker on the radiator support or the service manual to get the exact capacity for your model year.

How much oil does an AC compressor hold?

A typical AC compressor holds between 6 to 10 ounces of refrigerant oil. The exact amount depends on the compressor design and the vehicle’s total AC system volume. When replacing or servicing the compressor, it’s important to add the correct oil type and quantity.