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5W-30 Diesel Engine Oil

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Signature Series Max-Duty Synthetic Diesel Oil 5W-30
Signature Series Max-Duty Synthetic Diesel Oil 5W-30

Outstanding extreme-pressure protection
Delivers 6X more wear protection1
Maintains proper viscosity (thickness)
Minimizes oil consumption
Maximizes fuel efficiency
Excels in extreme temperatures

1Based on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 5W-30 as worst-case representation

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$15.29
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Preferred Price: $11.69
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Synthetic Diesel Oil SAE 5W-30
Synthetic Diesel Oil SAE 5W-30

• Outstanding protection for smaller American diesel pickups, vans, cars and SUVs
• Delivers up to 6X more wear protection than required by a leading industry standard1
• Retains viscosity for added engine protection and increased fuel economy
• Excels in hot and cold temperature extremes
• Minimizes oil consumption

1based on third-party testing in the OM646LA cam wear test using 0W-20 as worst-case representation

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$13.39
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Preferred Price: $10.09
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DP530QT-EA
$13.39
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SAE 5W-30 LS Synthetic European Motor Oil
SAE 5W-30 LS Synthetic European Motor Oil

Designed for the unique demands of gasoline, diesel and hybrid European vehicles.
European formula features precise blend of synthetic base oils and premium additives.
Exceptional engine protection without harming emissions systems.

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$17.99
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Series 3000 5W-30 Synthetic Heavy Duty Diesel Oil
Series 3000 5W-30 Synthetic Heavy Duty Diesel Oil

Available While Supplies Last
AMSOIL Series 3000 5W-30 Synthetic Diesel Oil is discontinued and available while supplies last. For a serious upgrade, try Signature Series Max-Duty 5W-30.

Recommended for applications specifying API CI-4+ and prior specifications
Extends drain intervals and maximizes fuel economy
Controls soot-thickening and wear
Reduces oil consumption and emissions
Excels in extreme temperatures
Try Signature Series Max-Duty 5W-30 for a serious upgrade

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$16.49
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Preferred Price: $12.69
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Synthetic Diesel Oil

Can diesel oil safely be use in gas engines?

It depends on the specifications the diesel oil carries and the recommendation of the original equipment manufacturer (OEM). The American Petroleum Institute (API) publishes its “C” category of specifications for diesel oil (currently CK-4) and its “S” category for gasoline motor oil (currently SP).

You can use diesel oil in a gas engine provided the diesel oil meets the appropriate specifications and viscosity requirements of your engine. For example, if your gas engine calls for a 5W-30 motor oil that meets the API SN specification, you can safely use a diesel oil of the correct viscosity that meets the API SN spec. For the typical gasoline application, however, a diesel oil isn’t required, and the more appropriate choice is a quality gasoline motor oil for both performance and value.

Why do diesel engines need specific oil?

Outside of differences in the fuel, the most notable difference between diesel and gas engines is the way each ignites the fuel. Diesel engines compress air in the combustion chamber until the temperature of the air increases enough to ignite the fuel (sprayed into the combustion chamber by the injector). Gasoline engines, on the other hand, use spark plugs that ignite a mixture of fuel and air at just the right time.

Diesel oil is formulated differently than gasoline oil in order to address issues specific to diesel engines, including higher engine temperatures, oxidation rates, soot levels and deposits. Find the best AMSOIL synthetic diesel oil for your application in the Product Lookup. AMSOIL diesel fuel additives also provide benefits designed to keep diesel engines operating at top performance.

How often should you perform a diesel oil change?

Refer to the vehicle owner’s manual for specific oil-change recommendations. AMSOIL synthetic diesel oils may be used beyond the OEM-recommended interval based on the service-life recommendations on the data sheets or with oil analysis. In addition, AMSOIL offers a full line of premium synthetic gear oil and transmission fluid to keep your diesel running at peak performance.