AMSOIL Signature Series Max-Duty 5W-40 is a fully synthetic diesel engine oil engineered for severe on-/off-road service. It’s formulated to provide outstanding extreme-pressure protection, maintain proper viscosity (thickness), help minimize oil consumption, keep turbos cleaner, perform in extreme temperatures and support confidently extended drain intervals.
Key Benefits
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Delivers 6X more wear protection
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Resists oxidation and the thickening effects of soot contamination
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Excels in extreme temperatures for hot operation and cold starts
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Helps minimize oil consumption (low volatility)
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Helps keep turbos cleaner
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Confidently extend drain intervals
Applications (Specifications / Approvals)
Use in diesel engines and, where appropriate, gasoline engines requiring any of the following specifications:
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API CK-4/SN, CJ-4, CI-4+, CF
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Volvo VDS-4.5, VDS-4, VDS-3
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Mack EOS-4.5, EO-O
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Renault RLD-4, RLD-3
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Cummins CES 20086, CES 20081
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Caterpillar ECF-3, ECF-2, ECF-1-a
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DDC 93K218, 93K215, 93K214
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DFS 93K222
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ACEA E9, E7
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MB 228.31, MB 228.51
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MAN 3575, MAN 3677
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MTU Type 2.1, II, I; MTU Type 3.1
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JASO DH-2
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Allison TES 439
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Deutz DQC III-10LA
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Deutz DQC IV-10LA
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Scania LDF-4
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Chrysler MS 10902
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Ford WSS-M2C171-F1
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Ford WSS-M2C214-B1
Change / Drain Interval (Service Life)
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Heavy-Duty On-/Off-Road: Three times (3X) OEM recommendation, not to exceed 60,000 miles / 600 hours / 1 year, whichever comes first
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Turbodiesel Pickup: Two times (2X) OEM recommendation, not to exceed 25,000 miles / 1 year, whichever comes first
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Competition Service Life: Provides lasting protection for multiple events; use oil analysis to determine appropriate drain intervals
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Gasoline Engine Service Life (where applicable): Two times (2X) OEM recommendation, not to exceed 15,000 miles / 1 year, whichever comes first
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Drain intervals may be extended further with oil analysis; refer to the product data bulletin notes for limitations.
Note: Always confirm the required viscosity and specifications in your vehicle/equipment owner’s manual before use.



