| Product Code | Package Size | Unit of Measure |
|---|---|---|
| DHDQT-EA | Quart Bottle | Each |
| DHDQT-CA | Quart Bottle | Case of 12 |
| DHD1G-EA | Gallon Jug | Each |
| DHD1G-CA | Gallon Jug | Case of 4 |
| DHDTP-EA | 2.5 Gallon Jug | Each |
| DHDTP-CA | 2.5 Gallon Jug | Case of 2 |
| DHD55-EA | 55 Gallon Drum | Each |
| DHD27-EA | 275 Gallon Tote | Each |
AMSOIL Signature Series 5W-30 100% Synthetic Max-Duty Diesel Oil delivers maximum-duty wear protection, viscosity stability, and extended drain capability for turbodiesel pickups, heavy-duty on- and off-road equipment, and fleet vehicles running hard in the toughest conditions.
Modern diesel engines run higher combustion pressures, hotter exhaust gas temperatures, and tighter tolerances than ever before. Soot loading, turbo coking, and extreme-pressure contact between rings and cylinder liners all degrade oil faster and push conventional and lower-tier synthetic formulations past their limits. A 5W-30 synthetic diesel oil needs to hold its viscosity under soot contamination, protect against scuffing under boundary lubrication conditions, and still flow in sub-zero cold starts.
6X MORE WEAR PROTECTION THAN THE DETROIT DIESEL STANDARD
In third-party testing using the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222, Signature Series Max-Duty delivered 6X more wear protection than required by the standard, using the 5W-30 viscosity as a worst-case representation. That same testing showed AMSOIL kept cylinder liners looking like new, while a leading conventional 15W-40 diesel oil produced severely scuffed liners under identical conditions. Ring and liner wear is the primary driver of compression loss, increased oil consumption, and reduced horsepower output over time. This level of scuffing resistance is directly relevant for Ford 6.7L Power Stroke, Ram 6.7L Cummins, and GM Duramax owners who tow regularly or run high-mileage service schedules.
UP TO 60% BETTER TURBO CLEANLINESS
Carbon deposits on turbo components restrict exhaust flow, reduce boost response, and can eventually lead to turbo failure. Signature Series Max-Duty provides up to 60% better turbo cleanliness based on the specification standards of CAT C13 2nd Ring Top Land Carbon testing. This matters in variable-geometry turbochargers common on modern diesel pickups and Class 8 trucks, where even minor deposit buildup affects vane actuation. If you are pulling heavy loads or running a tuned diesel making significantly more boost than stock, the turbo sees oil temperatures well beyond what a factory calibration produces.
RESISTS VISCOSITY INCREASE FROM SOOT CONTAMINATION
Diesel combustion generates soot, and that soot ends up in the oil. As soot particles accumulate, they can agglomerate into larger, abrasive clusters that thicken the oil and accelerate wear. Signature Series Max-Duty uses top-tier synthetic base oils and boosted detergent/dispersant additives to keep soot particles suspended independently, preventing the formation of wear-causing agglomerates. The oil retains its viscosity after high-temperature service, maintaining proper film strength and efficiency. Lower volatility also helps Signature Series retain its viscosity in grade over long drain intervals rather than thinning out from evaporative loss.
UP TO 76% LESS OIL CONSUMPTION
Signature Series Max-Duty provides up to 76% less oil consumption than required by the API CK-4 standard in the Caterpillar-1N oil consumption test, recording just 0.12 g/kWh versus the 0.5 g/kWh CK-4 limit. Low volatility (burn-off) means less oil vapor enters the combustion chamber, which reduces oil top-off frequency, keeps exhaust aftertreatment systems cleaner, and helps maintain proper oil level between services. For operators running Cummins ISX, Detroit DD13/DD15, or CAT C15 engines in long-haul or vocational applications, reduced consumption translates directly to lower operating costs.
UP TO 2X BETTER RUST PROTECTION
Equipment that sits between jobs or seasonal-use diesel pickups are vulnerable to internal corrosion from moisture condensation. Signature Series Max-Duty provides up to 2X better rust protection based on industry-standard testing using the NMMA FC-W Rust Test, scoring well below the pass/fail limit. This is particularly relevant for construction equipment, agricultural diesels, and trucks that experience extended idle periods.
EXCELS IN EXTREME TEMPERATURES
The 5W-30 viscosity grade gives Signature Series Max-Duty a significant cold-weather advantage over conventional 15W-40 diesel oils. The Signature Series 0W-40 (DZF) offers 4X better cold-cranking ability than a 15W-40 in ASTM D5293 testing, and the full product line is formulated with wax-free synthetic base oils that stay fluid in sub-zero temperatures for faster oil flow at startup and reduced dry-start wear. At the same time, the oil resists thermal breakdown at sustained high operating temperatures better than conventional and competing synthetic diesel oils.
SPECIFICATIONS AND COMPATIBILITY
Signature Series 5W-30 Max-Duty (DHD) meets or exceeds the following specifications: API CK-4/SN, CJ-4, CI-4+, CF, API SN+, API CF-2, Volvo VDS4.5, VDS4, VDS3, Mack EOS-4.5, EO-O, Renault RLD-4, RLD-3, Cummins CES20086, CES20081, Caterpillar ECF-2, ECF-3, ECF-1-a, DDC 93K218, 93K215, 93K214, DFS 93K222, ACEA E9, E7, ACEA E6, MB 228.31, MB 228.51, MAN 3575, MAN 3677, MTU Type 2.1, II, I, MTU Type 3.1, JASO DH-2, Ford WSS-M2C214-B1, Deutz DQC III-10LA, Deutz DQC IV-10LA, Chrysler MS 10902, Scania LA-2, and Allison TES439.
Compatible with other conventional and synthetic engine oils. Mixing with other oils will reduce the life expectancy and performance benefits of Signature Series. Aftermarket oil additives are not recommended.
SERVICE LIFE
Heavy-Duty On-/Off-Road: Three times (3X) OEM recommendation, not to exceed 60,000 miles/600 hours or one year, whichever comes first.
Turbodiesel Pickup: Two times (2X) OEM recommendation, not to exceed 25,000 miles or one year, whichever comes first.
Gasoline Engine: Two times (2X) OEM recommendation, not to exceed 15,000 miles or one year, whichever comes first.
Competition/Racing: Provides lasting protection for multiple events. Use oil analysis to determine appropriate drain intervals.
Drain intervals may be extended further with oil analysis. Extended drain intervals are not recommended for performance-modified engines, when using biofuels containing more than 10% ethanol or 15% biodiesel (B15), or for 2007-2009 Caterpillar C13 and C15 on-highway engines. 2007-2010 Dodge, Ford, and GM turbodiesel pickups are also not recommended for extended drain intervals when using the 5W-30 (DHD) viscosity.
| Property | 5W-30 (DHD) | 10W-30 (DTT) | 0W-40 (DZF) | 5W-40 (DEO) | 15W-40 (DME) |
|---|---|---|---|---|---|
| Kinematic Viscosity @ 100°C, cSt (ASTM D445) | 12.0 | 12.1 | 15.7 | 15.4 | 15.6 |
| Kinematic Viscosity @ 40°C, cSt (ASTM D445) | 72.3 | 78.2 | 92.8 | 94.5 | 116.4 |
| Viscosity Index (ASTM D2270) | 162 | 151 | 180 | 173 | 142 |
| CCS Viscosity @ °C, cP (ASTM D5293) | 5384 (-30) | 4858 (-25) | 5776 (-35) | 5555 (-30) | 4934 (-20) |
| Pour Point, °C (°F) (ASTM D97) | -43 (-45) | -42 (-44) | -48 (-54) | -43 (-45) | -40 (-40) |
| Four-Ball Wear Test (ASTM D4172), Scar, mm | 0.45 | 0.46 | 0.47 | 0.46 | 0.45 |
| NOACK Volatility, % weight loss (g/100g) (ASTM D5800) | 8.6 | 5.4 | 10.9 | 9.2 | 5.1 |
| Total Base Number (ASTM D2896) | 10.1 | 10.1 | 10.1 | 10.1 | 10.1 |
| High-Temperature/High-Shear Viscosity, cP (ASTM D5481) | 3.5 | 3.5 | 4.2 | 4.3 | 4.5 |
| Sulfated Ash Content, wt. % | 0.91 | 0.99 | 0.99 | 0.99 | 1.0 |
What vehicles and equipment is AMSOIL Signature Series 5W-30 Max-Duty Diesel Oil designed for?
AMSOIL Signature Series 5W-30 100% Synthetic Max-Duty Diesel Oil (DHDQT-EA) is developed for both diesel enthusiasts and hard-working commercial equipment in the most severe conditions. It delivers max-duty protection in on- and off-road applications, covering a wide range of equipment categories including auto/light truck, heavy-duty on-road, heavy-duty off-road, agriculture, motorcycle, ATV, UTV, snowmobile, marine outboard, and PWC. Verified customers report using it in engines such as the Detroit Diesel DD16, the 6.7L Powerstroke, and the 2024 6.6L diesel platform.
How does AMSOIL Signature Series 5W-30 diesel oil protect turbocharged diesel engines under heavy loads?
AMSOIL Signature Series 5W-30 Max-Duty Diesel Oil delivers up to 60% better turbo cleanliness based on CAT C13 2nd Ring Top Land Carbon testing specification standards. It is specifically formulated to withstand the extra demands placed on the turbocharger when pulling heavy loads or running performance tunes for maximum horsepower. The oil also resists oxidation and the thickening effects of soot contamination, retaining its viscosity after high-temperature service for consistent engine protection and efficiency.
What industry specifications and test standards does AMSOIL Signature Series 5W-30 Max-Duty Diesel Oil meet?
AMSOIL Signature Series 5W-30 Max-Duty Diesel Oil meets the API CK-4 standard and has been third-party tested against the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222, where it delivered 6X more wear protection than required. Turbo cleanliness performance is validated against CAT C13 2nd Ring Top Land Carbon testing specification standards, and rust protection is verified through the NMMA FC-W Rust Test, where it achieved up to 2X better rust protection.
How does AMSOIL Signature Series 5W-30 diesel oil compare to conventional 15W-40 diesel oil for cylinder liner wear?
In independent third-party testing using the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222, AMSOIL Signature Series 5W-30 Max-Duty Synthetic Diesel Oil was compared directly against a leading conventional 15W-40 diesel oil. The results showed that AMSOIL provided long-lasting wear protection, keeping cylinder liners looking like new. Additionally, it delivers 6X more protection against wear than required by Detroit Diesel's standard, and resists thermal breakdown better than conventional and competing synthetic diesel oils.
Can I extend drain intervals with AMSOIL Signature Series 5W-30 Max-Duty Diesel Oil?
Yes, AMSOIL Signature Series 5W-30 Max-Duty Diesel Oil is formulated so you can confidently extend drain intervals. The oil resists oxidation and the thickening effects of soot contamination, retains its viscosity after high-temperature service, and provides up to 76% less oil consumption than required by the API CK-4 standard in the Caterpillar-1N oil consumption test. These characteristics help the oil maintain its protective properties over longer service periods. Consult the Product Data Bulletin for specific drain interval recommendations for your application.
Is AMSOIL Signature Series 5W-30 diesel oil safe for diesel emissions systems and cold-weather starting?
AMSOIL Signature Series 5W-30 Max-Duty Diesel Oil meets the API CK-4 standard, which includes requirements for compatibility with modern diesel emissions systems. It also excels in extreme temperatures — staying fluid in sub-zero conditions for easier cold starting, improved oil flow, and reduced wear, while resisting thermal heat breakdown better than conventional and competing synthetic diesel oils in high-temperature operation. Its low oil consumption (up to 76% less than required by the API CK-4 standard) also helps minimize oil vapor entering emissions components.
Product Details PDF - AMSOIL SIGNATURE SERIES 5W-30 100% SYNTHETIC MAX-DUTY DIESEL OIL
