AMSOIL Signature Series Max-Duty Synthetic 15W-40 Diesel Oil is the premium of all AMSOIL Diesel Oils. The performance will explain it all!
If you push your truck beyond it’s design limits you’ll find this will keep up!
Maximum Engine ProtectionWear on rings and cylinder liners leads to increased oil consumption and loss of compression, resulting in reduced horsepower and fuel economy. Third-party
testing shows Signature Series Max-Duty delivers 6X more wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222,
delivering extra protection so you can push your diesel with peace of mind. Meets and exceeds API CK-4/SN, CJ-4, CI-4+, CF.
Sold in quarts, gallons, 2.5-gallon jug and cases of each. Drums and larger sizes are also available for added savings.
Buy & Check Price& Bottle Sizes
* For the best price after you click on the button above, focus on the blue Preferred Customer price box for the discounted price. Select the bottle size you want then the case. Example – select the 4-gallon case then divide by 4 comparing to the retail. The savings is HUGE!
Using top-tier synthetic base oils, AMSOIL Signature Series Max-Duty 15W-40 is naturally resistant to oxidation and the thickening effects of soot contamination. That, along with boosted detergent/dispersant additives, keeps soot particles suspended independently, helping prevent the formation of larger, wear-causing particles. Viscosity increase is minimized, and soot-related wear is controlled. Lower volatility also helps Signature Series Max-Duty retain its viscosity after high-temperature service for maximum engine protection and efficiency.
Printable Product Data Bulletin
Download PDFProduct Datasheet
AMSOIL Signature Series Max-Duty 15W-40 Synthetic Diesel Oil resists thermal (heat) breakdown better than conventional and competing synthetic diesel oils. Unlike conventional oils, Signature Series contains no wax, staying fluid in sub-zero temperatures for easier starting, improved oil flow and reduced wear. Signature Series 0W-40 (DZF) has a broad viscosity range that offers 4X better cold-cranking ability than a 15W-40, making it excellent for use in both hot-operating engines and cold-weather starting extremes.
AMSOIL Signature Series Max-Duty has a low rate of volatility (burn-off), reducing oil consumption during operation and passing less oil vapor into the combustion chamber. It provides up to 76 percent less oil consumption than required by the API CK-4 standard in the Caterpillar-1N oil consumption test.
Use in diesel engines and, where appropriate, gasoline engines requiring any of the following specifications:
AMSOIL Signature Series Max-Duty Synthetic Diesel Oil is compatible with other conventional and synthetic engine oils. Mixing AMSOIL diesel oils with other oils, however, will shorten the oil’s life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.
Aftermarket oil additives are not recommended for use with AMSOIL synthetic diesel oils. Stiction eliminators are not needed as a quality synthetic eliminates the need.
Diesel Engine Service Life
Heavy-Duty On-/Off-Road: Three times (3X) OEM1 recommendation, not to exceed 60,000 miles/600 hours or one year, whichever comes first.
Turbodiesel Pickup: Two times (2X) OEM1 recommendation, not to exceed 25,000 miles or one year, whichever comes first.
Gasoline Engine Service Life
Two times (2X) OEM1 recommendation, not to exceed 15,000 miles or one year, whichever comes first.
Drain intervals may be extended further with oil analysis.
1Refer to your owner’s manual for OEM drain interval recommendations and guidelines for severe and normal service.
Note: Extended drain intervals are not recommended for performance-modified engines, when using biofuels containing more than 10 percent ethanol or 15 percent biodiesel (B15) or for 2007-2009 Caterpillar* C13 and C15 on-highway engines. Extend drain intervals beyond OEM recommendations in these instances only with oil analysis. Note: 2007-2010 Dodge**, Ford** and GM** turbodiesel pickups are also not recommended for extended drain intervals when using DHD.
AMSOIL products are backed by a Limited Liability Warranty. For complete information visit AMSOIL Warranty Information
* All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.
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