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AMSOIL Signature Series Max-Duty Synthetic Diesel Oil provides 6X more wear protection than required by a leading industry standard1.

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Protection Boosted to the Max

Signature Series Max-Duty Synthetic
Diesel Oil

  • 6X more engine protection1 than required by a leading industry standard
  • Ultimate engine cleanliness and efficiency
  • Outstanding acid neutralization for long-term engine protection
  • Top-grade protection for extended drain intervals
  • Available in 5W-30, 0W-40, 5W-40 and 15W-40 viscosities
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Heavy-Duty Synthetic Diesel Oil

  • 4X more engine protection1 than required by a leading industry standard
  • Excellent engine cleanliness and efficiency
  • Outstanding acid neutralization for long-term engine protection
  • Outstanding protection for OEM-recommended drain intervals
  • Available in 10W-30, 5W-40 and 15W-40 viscosities
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More Built-In Diesel Engine Protection

 

Excessive wear to diesel cylinder liners and rings leads to increased oil consumption and loss of compression, reducing horsepower and fuel economy. AMSOIL delivers powerful protection for cylinder liners, rings and other critical components. In fact, independent testing shows AMSOIL Signature Series Max-Duty Synthetic Diesel Oil provides 6X more wear protection than required by a leading industry standard1. Our top-grade synthetic diesel oils deliver more than enough protection to handle the demands of your performance modifications and keep your diesel running strong in the most severe conditions.

About the Test

The Detroit Diesel DD13 Scffing Test for Specification DFS 93K222 simulates real-world use with a modified Detroit Diesel DD13 diesel engine running for 200 hours. Cylinder liner scuffing and top ring wear are measured and used oil analysis is performed to determine wear levels during the test.

Objective

This test method was developed to evaluate a lubricant’s performance protecting against adhesive wear between piston ring and cylinder liner.

Field Service Simulated

Heavy-duty, on-highway turbocharged and intercooled diesel engines equipped with EGR and running on ultra-low sulfur diesel fuel.

Test Fixture

Modified Detroit Diesel DD13 diesel engine, common rail fuel system, high-flow injectors, 12.8L, open chamber, in-line six-cylinder, four-stroke, turbocharged and intercooled.

Test Parameters

  • The test engine is operated for up to 200 hours or until scuffing occurs.
  • The test is performed using 15 PPM sulfur diesel fuel.
  • The first 30 hours are conducted at rated speed and approximately 800 Nm (~50% throttle).
  • The final 170 hours are conducted at rated speed and approximately 1,800 Nm (~80% throttle).

Test Parts Evaluation

  • Cylinder Liner Scuffing Rating
  • Top Ring Weight Loss

Used Lubricant Analysis

  • Viscosity @ 100°C (ASTM D445)
  • High Temp, High Shear (ASTM 4683)
  • High Temp, High Shear (ASTM 4683)
  • TAN (ASTM D664)
  • TBN (ASTM D4739)
  • Wear Metals (ASTM D5185)
  • Oxidation by FTIR
  • Soot by TGA

Pass/Fail Criteria

The pass/fail criteria of Hours to Scuff is based on the number of hours run prior to scuffing. This is evaluated based on a minimum level of cylinder liner scuffing, top ring weight loss achieved at EOT and point in test hours when a 25 PPM or greater iron concentration increase is observed in used oil analysis results.

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Engine Builders Love AMSOIL

“The cam looked great. The tappets looked good. There was no concern with either piece there. The protection is definitely there.”

~ Ben Shadday of Done Right Diesel, following a full racing season running AMSOIL products.

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Diesel Enthusiasts Love AMSOIL

"I have tried every kind of synthetic for a diesel engine and found AMSOIL to be the best by far. I have a E350 Ford* van with a 7.3 Power Stroke* engine. I have gained two miles per gallon and the motor runs smooth."

~ Pete, Chico, Calif.

 

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1Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222

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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 AMSOIL-engineered for use in the applications shown.