Detroit Fluids Specification (DFS) 93K222 — also referred to as DDC 93K222 — is Detroit Diesel Corporation’s DD13 oil specification and the governing approval standard for API CK-4 engine oils used across its heavy-duty DD-platform lineup, including the DD13, DD15, and DD16. It defines the minimum performance and approval requirements that a Detroit DD13 engine oil must meet to qualify for the extended drain intervals published by Detroit Diesel. DFS 93K222 superseded the earlier CJ-4 specification DFS 93K218 and is maintained alongside its companion specification DFS 93K223, which covers the newer API FA-4 category.
DFS 93K222 is an OEM-issued oil approval specification, not a third-party industry standard. Detroit Diesel Corporation maintains a formal Detroit diesel approved oil list for this specification. Oil manufacturers must submit their products for testing and registration to get DFS 93K222 approval; once approved, the product is listed on the official DFS 93K222 Approved Oils List, published and updated through the DTNA portal. The most recent revision is dated February 5, 2026.
DFS 93K222 defines the DD13 oil requirements, DD15 oil specification, and DD16 oil spec for the full current DD-platform lineup used in Freightliner, Western Star, Mercedes-Benz, and other DTNA vehicles:
| Engine | Displacement | Common Application |
|---|---|---|
|
12.8
|
Class 6–8 regional haul
|
|
|
DD15
|
14.8L
|
Class 8 long-haul flagship
|
|
DD16
|
15.6L
|
Class 8 heavy-haul, vocational
|
|
DD8
|
7.7L
|
Medium-duty Class 6–7
|
|
DD5
|
5.1L
|
Medium-duty Class 4–6
|
The specification also applies to certain legacy Detroit engines (Series 60, MBE 4000) in applicable model year ranges, per DDC-SVC-BRO-0001.
DFS 93K222 requires API CK-4 certification as its foundation. CK-4 oils must meet the following baseline requirements set by the American Petroleum Institute:
Beyond API CK-4, DFS 93K222 requires performance demonstration in Detroit’s own engine-specific test protocol — the DD13 Scuffing Test — which evaluates liner and ring wear under conditions specific to the DD-platform engine architecture.
The DD13 Scuffing Test is a Detroit Diesel engine stand test that defines the Detroit Diesel DD13 Scuffing Test requirements an oil must exceed to earn DFS 93K222 listing. It measures an oil’s ability to prevent scuffing of cylinder liners and piston rings under load conditions specific to DD-platform operation. Selecting the right DD13 oil type — one that has passed this test, not merely met API CK-4 — is what separates approved extended-drain oils from standard CK-4 oils.
Understanding the DFS 93K222 vs 93K218 and DFS 93K222 vs 93K223 distinctions clarifies why the correct specification matters for drain interval eligibility. The 93K218 vs 93K222 comparison is essentially the CJ-4 vs CK-4 Detroit Diesel transition: 93K222 introduced extended drain eligibility that 93K218 did not offer. Similarly, the FA-4 vs CK-4 Detroit DD13 question comes down to model year: FA-4 (93K223) is only permitted on GHG14 and newer configurations.
| Detroit Spec | API Category | Status |
|---|---|---|
|
DFS 93K214
|
CI-4 Plus
|
Legacy — pre-2007 engines only
|
|
DFS 93K218
|
CJ-4
|
Current — all DD-platform model years
|
|
DFS 93K222
|
CK-4
|
Current — all DD-platform model years
|
|
DFS 93K223
|
FA-4
|
Current — GHG14 and newer only; not permitted for EPA07
|
DFS 93K222 (CK-4) and DFS 93K223 (FA-4) are the two current specifications for GHG17-era engines. FA-4 oils are lower-viscosity formulations targeting fuel economy in newer emissions configurations; they are not backward-compatible with EPA07 engines. CK-4 oils meeting DFS 93K222 are fully backward-compatible across all DD-platform model years.
DFS 93K222 replaced DFS 93K218 as the preferred specification when API CK-4 replaced CJ-4 in 2016, and introduced extended drain interval eligibility beyond what the CJ-4 spec permitted.
Detroit’s published Detroit diesel oil drain intervals CK-4 for DD-platform engines are only available to operators using DFS 93K222 or DFS 93K223 approved oils with ULSD fuel below 15 ppm. The DD13 extended oil drain interval — and the Detroit DD13 oil change interval more broadly — varies by service classification as shown in the DDC-SVC-BRO-0001 oil drain table below:
| Service Class | Annual Miles | Avg. Fuel Economy | Notes |
|---|---|---|---|
|
Highly Efficient Long Haul
|
>60,000 mi
|
>7 mpg, minimal idle
|
Maximum intervals apply
|
|
Long Haul
|
>60,000 mi
|
6–6.9 mpg
|
Standard extended intervals
|
|
Short Haul
|
30,000–60,000 mi
|
5.1–5.9 mpg
|
Reduced intervals
|
|
Severe
|
<30,000 mi
|
<5 mpg
|
Shortest intervals
|
Specific interval values (in miles and kilometers) are published in DDC-SVC-BRO-0001, which Detroit updates periodically. Operators are advised to verify current intervals against the latest revision of that document.
Detroit’s Lube Oil and Oil Analysis Program allows further extension of drain intervals beyond published maximums when used in conjunction with used oil analysis, subject to copper, iron, lead, and other elemental limits defined in DDC-SVC-BRO-0001.
Note on new engines: During the first three oil drains, copper (Cu) levels may exceed normal specification limits — a normal result of oil cooler passivation in new DD-platform engines. Levels should decrease with each drain. Copper as high as 500 ppm during the first drain interval is considered acceptable.
This article will help you understand base oil groups in the context of lubricants. We will explore their classifications ad main differences.
DFS 93K222 does not mandate a single viscosity grade. The Detroit DD13 recommended viscosity depends on operating temperature and application, with 10W-30 and 15W-40 dominating the approved products list. For operators trying to identify the best oil for DD13 applications, Detroit’s viscosity selection guidance in Section 3.2 of DDC-SVC-BRO-0001 provides ambient temperature ranges for grade selection, with lighter grades appropriate for sustained cold-weather operation.
Detroit’s lubricant requirements document explicitly permits synthetic engine oils under DFS 93K222, provided the oil is on the approved products list. Synthetic oils meeting the specification offer no inherent approved status advantage over conventional oils — approval is based on test performance, not base oil type. However, synthetic formulations typically provide superior oxidation resistance, better low-temperature fluidity, and stronger viscosity retention under shoot contamination, all of which are relevant to extended drain interval performance.
The official DFS 93K222 Approved Oils List is maintained by Detroit Diesel and updated through the DTNA portal. As of the February 2026 revision, the list contains products from multiple suppliers across 10W-30 and 15W-40 as the dominant grades. Representative approved products include offerings from Castrol, Chevron (Delo), Shell (Rimula), ExxonMobil (Delvac), and others.
Operators should verify current approval status directly against the published list, as approval status can change between revisions. Approval of a product at one viscosity grade does not automatically confer approval at other grades from the same product line.
For operators sourcing oil through Vyscocity.com, AMSOIL Signature Series Max-Duty Synthetic Diesel Oil is available in DFS 93K222-compatible grades. Third-party testing in the DD13 Scuffing Test has demonstrated performance exceeding the specification standard by a significant margin — providing additional confidence for fleets running extended drains or severe-duty service cycles.
DFS stands for Detroit Fluids Specification. It is the naming convention used by Detroit Diesel Corporation (a Daimler Truck North America company) for its OEM-issued lubricant and fluid specifications.
No, but it requires API CK-4 as a prerequisite. DFS 93K222 adds the DD13 Scuffing Test requirement and formal product registration beyond what the API CK-4 certification alone covers. An oil can hold API CK-4 certification without appearing on the DFS 93K222 approved list.
Yes. CK-4 oils meeting DFS 93K222 are backward-compatible with earlier DD-platform engines and applicable legacy Detroit engines. Consult DDC-SVC-BRO-0001 for the specific model year and configuration applicability table.
DFS 93K218 covered API CJ-4 oils and remains a valid specification for DD-platform engines. DFS 93K222 (CK-4) superseded it as the preferred current specification when API CK-4 was introduced in 2016, offering extended drain intervals beyond what 93K218 permitted.
No. Using an approved oil from the official DFS 93K222 list is a condition that supports warranty compliance, not one that risks voiding it. Detroit’s warranty statement in DDC-SVC-BRO-0001 addresses lubricant requirements directly.
DFS 93K223 is Detroit’s FA-4 companion specification. FA-4 oils are permitted for GHG14 and newer DD-platform engines only; they are not approved for EPA07-era engines. Operators running mixed fleets should confirm engine model year before selecting FA-4.
This reference page is maintained by LubeGuide.org and is based on published Detroit Diesel documentation, including DDC-SVC-BRO-0001 (2021 edition) and the DFS 93K222 Approved Oils List (revised February 2026). LubeGuide does not represent Detroit Diesel Corporation or Daimler Truck North America. Specification details are subject to change; operators should verify requirements against current Detroit-published documentation.
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