DFS 93K222 is Detroit Diesel's proprietary engine oil specification for GHG17 DD13, DD15, and DD16 engines (2017 and newer). It supersedes API classification and requires oils to pass Detroit's own bench tests for shear stability, soot dispersancy, aeration control, and liner scuffing protection. Running an oil that meets DFS 93K222 is required for GHG17 DD13 warranty compliance.

Can I use CK-4 in a 2017+ GHG17 DD13?

Yes — CK-4 is acceptable in a GHG17 DD13 and will not damage the engine. However, FA-4 is Detroit's preferred specification for the GHG17 because the engine was engineered with tighter tolerances to work with FA-4's lower HTHS viscosity, which is where the fuel economy benefit comes from. Running FA-4 in a pre-2017 EPA10 DD13 is the situation to avoid.

What's the difference between DD13 and DD15 oil spec?

The DD13 (12.8L) and DD15 (14.8L) share the same oil specifications within each emissions generation. Both GHG17 DD13 and GHG17 DD15 require DFS 93K222 with FA-4 preferred at 5W-30 or 10W-30. Both EPA10 DD13 and EPA10 DD15 use CK-4 under DFS 93K218 at 15W-40 or 5W-40. The key difference is capacity — the DD15 holds approximately 36 quarts service fill vs the DD13's 26 quarts.

What AMSOIL oil is for a Detroit DD13?

For GHG17 DD13 (2017+): AMSOIL Signature Series Max-Duty 5W-30 DHD — meets DFS 93K222 FA-4. For EPA10 DD13 (pre-2017) in moderate climates: AMSOIL Signature Series Max-Duty 15W-40 DME — meets DFS 93K218 CK-4. For EPA10 DD13 in cold climates below -15 degrees Celsius: AMSOIL Signature Series Max-Duty 5W-40 DEO — meets DFS 93K218 CK-4.

How do I identify which DD13 I have — EPA10 or GHG17?

Three ways: Check the emissions certification decal on the driver-side door jamb or firewall — it will show EPA10 or GHG17 designation. Check the Engine Serial Number on the engine block — GHG17 DD13 ESNs start with prefix 47N. Or call Detroit Customer Support at 1-800-445-1980 with your ESN for confirmation.

Detroit Diesel DD13 — 12.8L Inline-6

Detroit DD13 Engine Oil — Spec, Capacity & Change Interval

Name: AMSOIL Signature Series Max-Duty 5W-30 Synthetic Diesel Oil (DHD)
Brand: AMSOIL
Rating: 4.8 (312 reviews)

The Detroit DD13 is the most common Class 8 diesel engine in North America — standard in the Freightliner Cascadia and Western Star 5700XE. Getting the oil spec right matters more on the DD13 than most engines because the 2017+ GHG17 generation uses FA-4, not the CK-4 that older DD13s and most other Class 8 engines require. Wrong oil, wrong generation = accelerated wear.

Last reviewed: March 2026 · Based on Detroit Diesel service documentation and AMSOIL technical data

2017+ DD13 (GHG17): Use a 5W-30 FA-4 meeting Detroit spec DFS 93K222. AMSOIL DHD is the recommended product. Pre-2017 DD13 (EPA10): Use a 15W-40 or 5W-40 CK-4 meeting DFS 93K218 or API CK-4. Oil capacity is approximately 26 qt (24.6 L) service fill with filter. Detroit's recommended drain interval is 50,000 km (31,000 mi) using DDEC oil life monitoring, or annually — whichever comes first.

26 qt

Service Fill
with Filter

12.8L

Displacement
Inline-6

5W-30

GHG17 (2017+)
FA-4 Required

15W-40

EPA10 (pre-2017)
CK-4 Required

DFS 93K222

Detroit's Proprietary Oil Spec — GHG17 Engines

Critical — Read First

DD13 Oil Spec by Generation — EPA10 vs GHG17

The DD13 has two distinct generations with different oil requirements. Using the wrong spec for your generation is the most common DD13 maintenance mistake. Check your emissions decal or ESN prefix before buying oil.

2008–2016

DD13 EPA10 / EPA13

Oil SpecAPI CK-4
Detroit SpecDFS 93K218
Primary Viscosity15W-40
Cold Climate5W-40 below −15°C
FA-4 Compatible?No — use CK-4 only
AMSOIL ProductDME 15W-40 / DEO 5W-40

2017+

DD13 GHG17 — Most Common Now

Oil SpecFA-4 Preferred
Detroit SpecDFS 93K222
Primary Viscosity5W-30
Also Acceptable10W-30 FA-4
CK-4 Acceptable?Yes, but not optimal
AMSOIL ProductDHD 5W-30

How to identify your DD13 generation: Check the emissions decal on the driver-side door jamb or firewall. EPA10 trucks will show a 2010 emissions certification. GHG17 trucks will show a 2017 GHG certification. You can also check the Engine Serial Number. If in doubt, call Detroit Customer Support with your ESN.

⚠ Do not use FA-4 in a pre-2017 DD13. FA-4 has lower High-Temperature High-Shear viscosity than CK-4. The EPA10 DD13 was designed around CK-4 film thickness. If your engine predates 2017, use CK-4.

Oil Capacity

Detroit DD13 Oil Capacity

Capacity varies slightly between the standard aluminum oil pan and the extended-sump steel pan used on some vocational and severe-service DD13 spec trucks. Always confirm against your specific engine's service label before filling.

Fill Type	Quarts	Litres	Gallons	Notes
Dry Fill	~28 qt	~26.5 L	~7 gal	New engine or rebuild
Service Fill with Filter	~26 qt	~24.6 L	~6.5 gal	Standard oil change
Filter Capacity	~1 qt	~0.95 L	~0.25 gal	Filter only
Extended Sump	~30–32 qt	~28–30 L	~7.5–8 gal	Vocational DD13 specs

⚠ Always verify capacity with your engine's service label. Overfilling causes oil foaming, aeration, and seal damage. Underfilling reduces oil pressure margin under high load.

Change Intervals

DD13 Oil Change Interval

Detroit's published drain interval for the DD13 is based on DDEC oil life monitoring. The system tracks load, idle time, fuel use, and temperature to estimate remaining oil life.

Detroit Factory Spec

50,000 km
(31,000 mi)

Using DDEC oil life monitoring or 1 year, whichever comes first.

Conventional Oil

15–25K mi
(24–40K km)

Typical drain range with conventional API CK-4 diesel oil.

AMSOIL Synthetic

Up to 60K mi
(96K km)

3× OEM recommendation, not to exceed 1 year. Oil analysis recommended.

Oil Analysis

Lab Confirmed

Use TBN, soot, viscosity, and wear metals to confirm safe intervals.

15–25K mi

Conventional

Highest annual change count.

31K mi

Detroit Factory

DDEC oil life monitor limit.

50–60K mi

Full Synthetic

AMSOIL Signature Series.

60K mi+

Oil Analysis

Only when lab confirmed.

⚠ Do not extend drain intervals blindly. High idle time, stop-and-go use, biodiesel blends, EGR cooler issues, or soot loading can shorten safe oil life.

FA-4 vs CK-4

FA-4 vs CK-4 on the DD13

This causes more confusion than any other DD13 maintenance topic. The answer depends on the engine generation.

FA-4 — GHG17 DD13

✓ Correct for 2017+ DD13 engines
✓ Designed for lower HTHS viscosity
✓ Meets Detroit DFS 93K222
✗ Do not use in pre-2017 DD13 engines

CK-4 — EPA10 DD13

✓ Correct for pre-2017 DD13 engines
✓ Higher HTHS viscosity
✓ Acceptable in many 2017+ applications
→ May give up some fuel economy in GHG17 engines

Simple rule: 2017+ GHG17 DD13 uses FA-4 5W-30 meeting DFS 93K222. Pre-2017 EPA10 DD13 uses CK-4 15W-40 or 5W-40 meeting DFS 93K218.

Detroit Spec

What Is DFS 93K222?

DFS 93K222 is Detroit Diesel's proprietary oil specification for modern Detroit heavy-duty engines. It is more specific than generic API classification and focuses on real Detroit engine failure points.

Shear Stability

Oil must retain viscosity under heavy mechanical shear.

Soot Handling

Oil must keep soot suspended and prevent larger wear-causing particles.

Aeration Control

Oil must resist air entrainment that reduces film strength.

Liner Scuffing

Detroit's scuffing test directly measures cylinder liner protection.

Spec	Applies To	API Equivalent	Viscosity
DFS 93K218	Pre-2017 DD13 / DD15 / DD16	CJ-4 / CK-4	15W-40, 5W-40
DFS 93K222	2017+ DD13 / DD15 / DD16	FA-4 preferred / CK-4 acceptable	5W-30, 10W-30

Best AMSOIL Oil for the Detroit DD13

Match the product to your DD13 generation. Running the wrong product for your emissions tier is one of the most avoidable DD13 maintenance mistakes.

GHG17 DD13 2017+

AMSOIL Signature Series Max-Duty

5W-30 · DHD · FA-4

For 2017+ DD13 GHG17 engines
Meets Detroit DFS 93K222
Recommended FA-4 viscosity
Best match for modern Freightliner Cascadia DD13 engines

Shop DHD 5W-30 →

EPA10 DD13 Pre-2017

AMSOIL Signature Series Max-Duty

15W-40 · DME · CK-4

For pre-2017 DD13 engines
Correct CK-4 viscosity
Best for moderate to warm climates
Strong hot-temperature film protection

Shop DME 15W-40 →

EPA10 Cold Climate

AMSOIL Signature Series Max-Duty

5W-40 · DEO · CK-4

For pre-2017 DD13 engines in colder climates
Better cold-start flow than 15W-40
Same operating-temperature protection
Good choice for Canadian winter routes

Shop DEO 5W-40 →

Not sure which product fits your DD13?

Use the AMSOIL heavy-duty lookup to cross-reference your engine make, model, year, and emissions tier.

Use the AMSOIL Heavy-Duty Lookup →

Compare Tiers

AMSOIL DD13 Oil — Which Tier Is Right for You?

Not every truck or budget calls for the same product. AMSOIL makes multiple diesel oil tiers depending on the job.

Product	Protection Level	Drain Interval	Best For
Signature Series Max-DutyDHD / DME / DEO	Top-tier synthetic diesel protection	Extended drain capable with proper application	Owner-operators and fleets maximizing uptime
Heavy-Duty SyntheticADN / ADO / ADP	Full synthetic protection	OEM interval	Operators wanting synthetic protection at lower upfront cost
Commercial-GradeSBDT / SBDF	Synthetic-blend upgrade	OEM interval	Fleets upgrading from conventional oil

Always match the oil to the DD13 generation, viscosity requirement, and Detroit specification. Use oil analysis when extending intervals.

Oil Analysis

Why DD13 Fleets Should Run Oil Analysis

The GHG17 DD13 runs high EGR rates, which means soot loading is a real factor. Mileage alone does not tell you the full story.

A basic oil analysis sample checks the numbers that matter:

→ TBN: remaining acid-neutralizing reserve
→ Soot: soot loading and viscosity risk
→ Wear metals: iron, copper, chromium, aluminum
→ Coolant contamination: early warning for cooler or gasket problems

Get an Oil Analysis Kit →

DD13 EGR Cooler — The Failure to Watch

The DD13 EGR cooler is a known issue on higher-mileage engines. When coolant reaches the intake stream or oil, damage gets expensive fast.

Oil analysis can show glycol or sodium before symptoms are obvious.

What Oil Analysis Can Save

Analysis kit	$25–$40
Early EGR cooler detection	Major repair avoided
Confirmed drain extension	Fewer oil changes
Liner wear detection	Rebuild risk reduced

FAQ

Detroit DD13 Engine Oil — Common Questions

From owner-operators, fleet managers, and shop techs running the DD13 across North America.

What oil does a Detroit DD13 take?

It depends on your DD13 generation. 2017+ GHG17 DD13 engines use 5W-30 FA-4 meeting DFS 93K222. Pre-2017 EPA10 DD13 engines use 15W-40 or 5W-40 CK-4 meeting DFS 93K218.

What is the oil capacity of a Detroit DD13?

The standard DD13 service fill with filter is approximately 26 quarts, or 24.6 litres. Extended-sump vocational versions may hold more, so always verify against the engine service label.

How often should you change oil in a Detroit DD13?

Detroit's factory interval is commonly 50,000 km or 31,000 miles using DDEC oil life monitoring, or one year. AMSOIL Signature Series can support longer intervals in the right service, but oil analysis is recommended.

Does the DD13 use FA-4 or CK-4?

Both, depending on generation. 2017+ GHG17 DD13 engines use FA-4 as the preferred oil spec. Pre-2017 EPA10 DD13 engines use CK-4.

What AMSOIL oil is best for a Detroit DD13?

For 2017+ GHG17 DD13 engines, use AMSOIL Signature Series Max-Duty 5W-30 DHD. For pre-2017 DD13 engines, use AMSOIL Signature Series Max-Duty 15W-40 DME or 5W-40 DEO in colder climates.

What trucks use the Detroit DD13 engine?

The DD13 is commonly found in Freightliner Cascadia trucks, Western Star applications, and some bus and vocational platforms. It is Detroit's mid-range heavy-duty engine below the DD15 and DD16.