Detroit Diesel DD13 — 12.8L Inline-6
Detroit DD13 Engine Oil — Spec, Capacity & Change Interval
The Detroit DD13 is the most common Class 8 diesel engine in North America — standard in the Freightliner Cascadia and Western Star 5700XE. Most DD13 oil confusion comes from two Detroit specs: DFS 93K222 (API CK-4) and DFS 93K223 (API FA-4). Every DD13 can run 93K222. EPA10 and newer DD13s can also run 93K223. Get the spec right, buy the right quantity, and run Detroit's interval for your duty cycle.
Last reviewed: October 2026 · Based on Detroit Diesel (DTNA) service literature and AMSOIL data sheet G3467
A Detroit DD13 oil and filter change takes 40 quarts (38 L, 10 US gallons). Every DD13 can use oil meeting DFS 93K222 (API CK-4); EPA10, GHG14 and GHG17 DD13s may also use DFS 93K223 (API FA-4). Detroit's oil change interval runs from 35,000 mi in severe service to 65,000 mi in efficient long haul. My pick for every DD13: AMSOIL Max-Duty 15W-40 (DME).
Change
Inline-6
Every DD13
Efficient Long Haul
DD13 Oil Spec by Generation — EPA07 vs EPA10 and Newer
Detroit splits DD13 oil by emissions generation, not by 2017. EPA07 DD13s must use DFS 93K222 (CK-4). EPA10, GHG14 and GHG17 DD13s can use either DFS 93K222 (CK-4) or DFS 93K223 (FA-4). Check your emissions decal before buying oil, then pick the spec your fleet stocks.
- Oil SpecAPI CK-4
- Detroit SpecDFS 93K222
- Primary Viscosity15W-40
- Cold Climate5W-40
- FA-4 Allowed?No — 93K222 (CK-4) only
- AMSOIL ProductDME 15W-40 / DEO 5W-40
- CK-4 SpecDFS 93K222
- FA-4 SpecDFS 93K223
- Which to Run?Either is approved
- Detroit Preference93K223 for fuel economy
- CK-4 Acceptable?Yes — fully approved
- AMSOIL ProductDME 15W-40 / DHD 5W-30
How to identify your DD13 generation: Check the emissions certification label on the engine or door jamb. It shows EPA07, EPA10, GHG14 or GHG17. If in doubt, call Detroit Customer Support with your Engine Serial Number.
⚠ Do not use FA-4 in an EPA07 DD13. Detroit limits EPA07 engines to DFS 93K222 (CK-4). FA-4's lower high-temperature high-shear (HTHS) viscosity is only approved on EPA10 and newer DD13s.
Detroit DD13 Oil Capacity
A DD13 truck engine takes 40 quarts (38 L) at an oil and filter change, per Detroit's own capacity tables. Total dry volume after a rebuild is 46.5 quarts (44 L), because about 6 quarts stays in the engine at a normal drain. DD13 coach engines hold more: 47.6 quarts at an oil and filter change.
| Fill Type | Quarts | Litres | Gallons | Notes |
|---|---|---|---|---|
| Oil & Filter Change | 40 qt | 38 L | 10 gal | Standard oil change, truck engine |
| Total Dry Volume | 46.5 qt | 44 L | 11.6 gal | New engine or rebuild |
| Sump Volume | 37 qt | 35 L | 9.25 gal | Oil pan only |
| Dipstick Min to Max | 5.2 qt | 5 L | 1.3 gal | Top-off range |
| Coach Oil & Filter Change | 47.6 qt | 45 L | 11.9 gal | DD13 coach (EPA10) |
⚠ 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.
Buy the Right Oil for a DD13 Service
A DD13 oil and filter change takes 40 quarts, which is 10 US gallons. That's exactly two AMSOIL Twin Packs (two 2.5-gallon jugs each): one full service, nothing left over. For fleets, one 55-gallon drum covers five DD13 services with 20 quarts left for top-offs.
- Meets the requirements of DFS 93K222
- One service: 2 Twin Packs (DMETP-CA) = 10 gal
- The oil I recommend for every DD13
- Meets the requirements of DFS 93K222
- One service: 2 Twin Packs (DHDTP-CA) = 10 gal
- One oil for mixed fleets and cold starts
- Lower cost per service than jugs
- One 275-gallon tote covers 27 DD13 services
- Shipped direct to your shop or yard
Run Detroit's interval for your duty cycle (up to 65,000 mi in efficient long haul). Want to go past it? Do it on oil analysis, not guesswork. Get an Oil Analysis Kit →
DD13 Oil Change Interval
Detroit sets the DD13 oil and filter interval by service category, on DFS 93K222 or 93K223 oil: 65,000 mi in efficient long haul (over 7.0 mpg), 55,000 mi in long haul (6.0–6.9 mpg), 40,000 mi or 1,000 hours in short haul, and 35,000 mi or 750 hours in severe service.
(105,000 km)
(89,000 km)
(64,000 km) or 1,000 hr
(56,000 km) or 750 hr
⚠ Going past Detroit's interval? Do it on oil analysis. On modern DD13s, Detroit's own intervals already reach 55,000–65,000 mi. A good synthetic gives you more margin inside that interval. Going beyond it safely takes a lab report on your own truck, because high idle time, biodiesel blends, EGR cooler leaks and soot loading all shorten oil life.
FA-4 vs CK-4 on the DD13
Both are approved on EPA10 and newer DD13s. DFS 93K222 is Detroit's CK-4 spec (minimum HTHS 3.7 cP) and covers every DD13. DFS 93K223 is Detroit's FA-4 spec (minimum HTHS 2.9 cP) for EPA10, GHG14 and GHG17 engines, where Detroit recommends it for fuel economy.
FA-4 — DFS 93K223
- ✓ Approved for EPA10, GHG14 and GHG17 DD13s
- ✓ Lower HTHS viscosity for fuel economy
- ✓ Detroit's recommended spec on EPA10 and newer
- ✗ Not approved for EPA07 DD13s
CK-4 — DFS 93K222
- ✓ Approved for every DD13, EPA07 through GHG17
- ✓ Higher HTHS viscosity, more film strength
- ✓ One spec for mixed-generation fleets
- → May give up a little fuel economy vs FA-4
Simple rule: DFS 93K222 (CK-4) works in every DD13. DFS 93K223 (FA-4) is approved on EPA10 and newer, but never in an EPA07 engine. Note: AMSOIL's heavy-duty diesel oils are CK-4 oils that meet DFS 93K222; AMSOIL does not currently offer a 93K223 FA-4 oil.
What Is DFS 93K222?
DFS 93K222 is Detroit Diesel's engine oil specification built on API CK-4, with a minimum HTHS viscosity of 3.7 cP. It adds Detroit's own testing on top of the API category, including a DD13 liner scuffing test, and covers every DD13, DD15 and DD16 from EPA07 onward.
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 93K222 | Every DD13 / DD15 / DD16, EPA07 onward | API CK-4 · HTHS ≥ 3.7 cP | 15W-40, 10W-30, 5W-30, 5W-40 |
| DFS 93K223 | EPA10 / GHG14 / GHG17 only | API FA-4 · HTHS ≥ 2.9 cP | Low-viscosity FA-4 grades |
| DFS 93K218 | Older CJ-4-era spec | API CJ-4 | Superseded by 93K222 |
Best AMSOIL Oil for the Detroit DD13
For every DD13, I recommend AMSOIL Signature Series Max-Duty 15W-40 (DME), a CK-4 oil that meets the requirements of DFS 93K222. Max-Duty 5W-30 (DHD) is the fuel-economy and mixed-fleet option, and Max-Duty 5W-40 (DEO) is the cold-climate pick.
- Meets the requirements of DFS 93K222
- Approved spec for EPA07 through GHG17
- 6X more wear protection than Detroit's DD13 scuffing test requires
- Strong hot-temperature film protection (HTHS 4.5)
- Meets the requirements of DFS 93K222
- Lower viscosity for GHG17 fuel economy
- Also lists Cummins CES 20086, Mack EOS-4.5, Volvo VDS-4.5
- Cold cranking to −30°C (−22°F)
- Meets the requirements of DFS 93K222
- Cold cranking to −30°C vs −20°C for 15W-40
- Good choice for Canadian winter routes
Use the AMSOIL heavy-duty lookup to cross-reference your engine make, model, year, and emissions tier.
Use the AMSOIL Heavy-Duty Lookup →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 | OEM interval; beyond it with oil analysis | 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 |
All three tiers are CK-4 oils that meet the requirements of DFS 93K222. Run Detroit's interval for your duty cycle, and use oil analysis before going past it.
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
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.
| Analysis kit | A fraction of one oil change |
| Early EGR cooler detection | Major repair avoided |
| Confirmed drain extension | Fewer oil changes |
| Liner wear detection | Rebuild risk reduced |
Detroit DD13 Engine Oil — Common Questions
From owner-operators, fleet managers, and shop techs running the DD13 across North America.