Best Oil for Diesel Engine Protection | AMSOIL Synthetic Motor Oil
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More Built-In Diesel Engine Protection

Engine Protection

Wear ProtectionExcessive wear to diesel cylinder liners and rings leads to increased oil consumption and loss of compression, reducing horsepower and fuel economy.

Independent testing shows AMSOIL Signature Series Max-Duty Synthetic Diesel Oil provides 6X more wear protection than required by the standard*. In the same test, AMSOIL Heavy-Duty Synthetic Diesel Oil delivers 4X more protection against wear than required by Detroit Diesel’s standard*.

Detroit Diesel, a leader in diesel engine technology, sets a standard for measuring cylinder liner and ring wear with its DD13 Scuffing Test for the DFS 93K222 specification. Testing of AMSOIL synthetic diesel oils was conducted by an independent lab in accordance with the following parameters:

More Protection and Confidence

The test 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.

With our top-grade synthetic diesel oils under your hood, you can be confident that there’s more than enough protection to handle the demands of your performance modifications and keep your diesel running strong in the most severe conditions.

*Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222