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AMSOIL Dominator 20W-50 Competition Diesel OilAMSOIL has released a brand-new 100% synthetic diesel engine oil for mega-horsepower diesel pick-ups. The new AMSOIL Dominator 20W-50 Competition Diesel Oil is designed for high-output diesel engines used for competition, off-road and street use.

Why Did AMSOIL Make A 20W-50 For Diesel Engines?

Big diesel horsepower requires big wear protection. Period. Diesel engines modified for competition such as sled pulls, drag racing and dyno challenges routinely crank out more than 1000 horsepower. Modified street diesels commonly make 600-800 horsepower.

When these trucks put are under severe loads, they require a motor oil with heavier viscosity as well as extraordinary film strength and shear stability. AMSOIL also loaded this product with zinc which provides exceptional wear protection.

Is Dominator 20W-50 Competition Diesel Oil Suitable For Street use?

Dominator 20W-50 Diesel Oil is quite suitable for street, off-road or competition trucks. It meets the latest API CK-4 and CJ-4 specs making it quite suitable for new trucks. It is also suitable for older engines that require older diesel oil specs.

Is Dominator 20W-50 Diesel Suitable For Cold Weather?

Dominator 20W-50 Diesel Oil has a cold-pour-point of -37°C. It will provide fast oil flow on cold start-ups. For arctic conditions, go with the AMSOIL Max-Duty Signature Series Diesel Series.

Is AMSOIL Dominator 20W-50 Diesel Oil Expensive?

No, this product is a remarkable value. It is is priced very closely to our premium AMSOIL Max-Duty Signature Series Diesel Oil products.  Considering the performance and wear protection that Dominator Diesel 20W-50 provides, this is the most cost-effective upgrade you can add to your engine. See more on requesting prices below.

Can AMSOIL Dominator 20W-50 Competition Diesel Oil Be Used In Gasoline Engines?

This product can be used in gasoline-powered engines. While it is suitable for gas motors, a more appropriate choice for classic or high-performance engines would be AMSOIL Dominator Racing 15W-50 or Z-Rod 20W-50. This 20W-50 Diesel Oil would not be appropriate for modern passengers cars or light trucks.

Where Can I Buy AMSOIL Dominator 20W-50 Competition Diesel Oil?

Oildepot can sell AMSOIL Dominator 20W-50 Competition Diesel Oil at the lowest prices in Canada or the United States. For the latest wholesale price list, contact us using the form on this page. We’ll rush you the latest prices and information on wholesale account options.

AMSOIL has released more information on their brand new line of synthetic diesel engine oils. This extensive new line-up will be released in early 2017 and will cover a wide variety of industry specs and applications. The most notable specification is the new API CK-4 heavy-duty diesel motor oil standard.

AMSOIL API-CK-4 Diesel Engine Oils

AMSOIL’s 2017 API CK-4 Diesel Engine Oil Line-up

Latest News On Ford Power Stroke Engine Oil Controversy

You may have heard about Ford claiming that the new API CK-4 diesel oils can cause damage in Power Stroke diesel engines. Some API CK-4 oils have a phosphorus content of less than 1000 parts per million (ppm). Ford is contending that their testing shows accelerated valve train wear with some CK-4 formulations. For now, Ford is recommending the use of engine oil meeting the current API CJ-4 spec which has a phosphorous limit of 0.12% by volume (this works out to 1000 to 1200 ppm).

Here is why there is much confusion. It used to be that if an engine oil had both the API heavy-duty diesel and passenger car specifications on the label, the oil maker could abide by the higher phosphorous limit of the diesel spec. Some are suggesting that this loophole is now closed, implying that if an oil maker has both API CK-4 and the API SN (passenger car spec) on the label, the lower phosphorous limit (800 ppm) of the passenger car SN spec has to be followed. This is only partially true.

The API tells us that the phosphorous limit loophole still exists for most grades of heavy-duty diesel engine oil. The important distinction is that ILSAC viscosity grades (0W-30, 5W-30 and 10W-30) will have the lower phosphorous limit of 800 ppm, if a product carries the API SN spec along with API CK-4. Thankfully, 40-weight diesel engine oils can still have the API SN designation and abide by the higher phosphorous limit of the diesel spec.

There are indications that when the API SP passenger motor oil specification is introduced in 2018, diesel oils carrying both the SP and CK-4 specs will have to abide by the SP phosphorous limit. The way around this will be for an engine oil to carry the previous API SN spec instead of SP.

AMSOIL’s New API CK-4 Oils And Phosphorous Content

The only AMSOIL product that will have a lower phosphorous limit is the upcoming AMSOIL Signature Series 5W-30 Max-Duty Synthetic Diesel Oil. As a 5W-30 carrying the API SN spec, it has to abide by the SN phosphorus limit of 800 ppm. The phosphorus limitation does not apply to the rest of the new diesel engine oils, so there will be zero issues with using them in Ford Power Stroke Diesels.

All but the Signature Series 5W-30 Max-Duty will carry the new Ford WSS-M2C171-F1 spec which will designate them as safe and approved for all model year Ford Power Stroke engines. But that doesn’t mean that the Signature Series 5W-30 Max-Duty will be a lightweight. AMSOIL has indicated that it is loaded with anti-wear technology and will eventually be proven safe for Ford Power Strokes as well. But for now, they are leaving the Ford WSS-M2C171-F1 spec off of the label.

Note that the new AMSOIL Heavy-Duty 10W-30 Synthetic Diesel Engine Oil does not carry the API SN specification. Being a 10W-30, had they marketed it as an API SN product (for passenger car service), they would have had to defer to the 800 ppm phosphorous limit for API SN. Heavy Duty 10W-30 carries only heavy-duty diesel oil specs such as API CK-4. It also lists the Ford WSS-M2C171-F1 spec, making it suitable for Power Stoke engines.

Specifications Covered By the 2017 AMSOIL Synthetic Diesel Engine Oil Series

Here is a brief description of each of the brand new API CK-4 AMSOIL Diesel Engines Oils. This line will launch in February, 2017.

AMSOIL Signature Series 5W-30 Synthetic Diesel Engine Oil

This 5W-30 product is part is the “Max Duty” Signature Series of synthetic diesel oils. It will be a premium synthetic choice for modern diesel applications requiring a 5W-30. This product will not be replacing the “HDD” Series 3000 5W-30 Diesel Engine Oil. HDD 5W-30 will still be available for older diesel engines requiring the API CI-4+ spec. Here are the specifications covered by Signature Series Diesel 5W-30.

  • API CK-4/SN, CJ-4, CI-4+, CF
  • ACEA E9, E7, E6
  • Chrysler MS 10902
  • Mack EOS-4.5, EO-O
  • Detroit Diesel DFS 93K222, DDC 93K218, 93K215, 93K214
  • Caterpillar ECF-3, ECF-2, ECF-1-a
  • Cummins CES20086, CES20081
  • Volvo VDS-4.5, VDS-4, VDS-3
  • MB 228.51, 228.31
  • MTU Type 3.1, 2.1, II, I
  • MAN 3677, 3575
  • JASO DH-2
  • Renault RLD-4, RLD-3
  • Deutz DQC IV-10 LA, DQC III-10 LA
  • Scania LA-2

AMSOIL Signature Series 0W-40 Synthetic Diesel Engine Oil

At long last, AMSOIL will offer a heavy-duty 0W-40 diesel engine oil. This premium 0W-40 will be ideal for diesel engines that operate in extreme cold. It will also be suitable for year-round use. Here are the specifications covered by Signature Series Diesel 0W-40.

  • API CK-4/SN, CJ-4, CI-4+, CF
  • ACEA E9, E7
  • Chrysler MS 10902
  • Ford WSS-M2C171-F1
  • Mack EOS-4.5, EO-O
  • Detroit Diesel DDC 93K218, 93K215, 93K214
  • Caterpillar ECF-3, ECF-2, ECF-1-a
  • Cummins CES20086, CES20081
  • Volvo VDS-4.5, VDS-4, VDS-3
  • MTU Type 2.1, II, I
  • MAN 3575
  • JASO DH-2
  • Renault RLD-4, RLD-3
  • Deutz DQC III-10 LA
  • Ford WSS-M2C171-F1

AMSOIL Signature Series 5W-40 Synthetic Diesel Engine Oil

This product will replace “DEO” AMSOIL Premium 5W-40 Synthetic Diesel Engine Oil. This new API CK-4 5W-40 will be the go-to product for diesel pick-up owners looking for a premium motor oil. As it covers the Chrysler MS 10902 spec, it will also be the premium choice for Ram EcoDiesel pick-ups. The Ford WSS-M2C171-F1 spec will also be covered by this oil, making it a great option for all model year Ford Power Stroke engines.

  • API CK-4/SN, CJ-4, CI-4+, CF
  • ACEA E9, E7
  • Chrysler MS 10902
  • Ford WSS-M2C171-F1
  • Mack EOS-4.5, EO-O
  • Detroit Diesel DFS 93K222, DDC 93K218, 93K215, 93K214
  • Caterpillar ECF-3, ECF-2, ECF-1-a
  • Cummins CES20086, CES20081
  • Volvo VDS-4.5, VDS-4, VDS-3
  • MB 228.31
  • MTU Type 2.1, II, I
  • MAN 3575; JASO DH-2
  • Renault RLD-4, RLD-3
  • Deutz DQC III-10 LA
  • Allison TES-439
  • Scania LA-2

AMSOIL Signature Series 15W-40 Synthetic Diesel Engine Oil

Signature Series 15W-40 will replace the API CJ-4 “DME” AMSOIL Premium 15W-40 Synthetic Diesel Engine Oil. This will be AMSOIL’s premium 15W-40 for pick-ups and heavy-duty engines of all model years.

  • API CK-4/SN, CJ-4, CI-4+, CF
  • ACEA E9, E7
  • Chrysler MS 10902
  • Ford WSS-M2C171-F1
  • Mack EOS-4.5, EO-O
  • Detroit Diesel DFS 93K222, DDC 93K218, 93K215, 93K214
  • Caterpillar ECF-3, ECF-2, ECF-1-a
  • Cummins CES20086, CES20081
  • Volvo VDS-4.5, VDS-4, VDS-3
  • MB 228.31
  • MTU Type 2.1, II, I
  • MAN 3575; JASO DH-2
  • Renault RLD-4, RLD-3
  • Deutz DQC III-10 LA
  • Scania LA-2

AMSOIL Heavy-Duty Protection 10W-30 Synthetic Diesel Engine Oil

A 10W-30 diesel motor oil is often suggested for Ford Power Stroke engines in colder climes. The new Heavy-Duty Protection Synthetic 10W-30 will meet the Ford WSS-M2C171-F1 spec making it a safe choice for diesel engines in F-Series trucks. This new diesel 10W-30 will replace AMSOIL OE 10W-30 Synthetic Diesel Engine Oil.

  • API CK-4, CJ-4, CI-4+, CF
  • ACEA E9, E7
  • Ford WSS-M2C171-F1
  • Mack EOS-4.5, EO-O
  • Detroit Diesel DFS 93K222, DDC 93K218, 93K215, 93K214
  • Caterpillar ECF-3, ECF-2, ECF-1-a
  • Cummins CES20086, CES20081
  • Volvo VDS-4.5, VDS-4, VDS-3
  • MB 228.31
  • MTU Type 2.1, II, I
  • MAN 3575
  • JASO DH-2
  • Renault RLD-4, RLD-3
  • Deutz DQC III-10 LA

AMSOIL Heavy-Duty Protection 5W-40 Synthetic Diesel Engine Oil

This new 5W-40 Synthetic Diesel Oil will be moderately priced and a versatile addition to the line-up. It will cover the full spectrum of industry specs including API CK-4, Chrysler MS 10902 and Ford WSS-M2C171-F1. This will make it a great choice for budget-minded Ford Power Stroke and Ram EcoDiesel owners.

  • API CK-4/SN, CJ-4, CI-4+, CF
  • ACEA E9, E7
  • Chrysler MS 10902
  • Ford WSS-M2C171-F1
  • Mack EOS-4.5, EO-O
  • Detroit Diesel DFS 93K222, DDC 93K218, 93K215, 93K214
  • Caterpillar ECF-3, ECF-2, ECF-1-a
  • Cummins CES20086, CES20081
  • Volvo VDS-4.5, VDS-4, VDS-3
  • MB 228.31
  • MTU Type 2.1, II, I
  • MAN 3575
  • JASO DH-2
  • Renault RLD-4, RLD-3
  • Deutz DQC III-10 LA

AMSOIL Heavy-Duty Protection 15W-40 Synthetic Diesel Engine Oil

This new API CK-4 15W-40 will replace AMSOIL OE 15W-40 Synthetic Diesel Engine Oil. It will be moderately priced and ideal for fleets and commercial use.

  • API CK-4/SN, CJ-4, CI-4+, CF
  • ACEA E9, E7
  • Chrysler MS 10902
  • Ford WSS-M2C171-F1
  • Mack EOS-4.5, EO-O
  • Detroit Diesel DFS 93K222, DDC 93K218, 93K215, 93K214
  • Caterpillar ECF-3, ECF-2, ECF-1-a
  • Cummins CES20086, CES20081
  • Volvo VDS-4.5, VDS-4, VDS-3
  • MB 228.31
  • MTU Type 2.1, II, I
  • MAN 3575
  • JASO DH-2
  • Renault RLD-4, RLD-3
  • Deutz DQC III-10 LA

AMSOIL Synthetic 15W-40 API-CJ-4 Diesel OilA reader asks: I see that you carry wide variety of AMSOIL diesel engine oils and I find the selection to be a bit confusing. What is the difference between the “Premium” and “Heavy-Duty” diesel oils? Are the “Premium” diesel oils suitable for heavy-duty diesel engines?

Our answer: Great question and yes, all of the AMSOIL diesel motor oils are suitable for heavy-duty engines. When choosing a diesel engine oil, the very first thing you must do is determine the industry specification required by the engine maker. This is very important. The second thing to do is choose a viscosity. Your owner’s manual should offer some recommendations on both of these points.

Let’s look at the various categories of AMSOIL Diesel Oils and hopefully take some of the confusion out of this issue.

Premium Synthetic Diesel Oil

There are two products in this category. The “DEO” Premium 5W-40 Synthetic Diesel Oil and the “DME” Premium 15W-40 Synthetic Diesel Oil. These products are ideal for any heavy-duty or pick-up truck service. They are the finest offering from AMSOIL for applications requiring the very latest API CJ-4 specification as well as older diesel specs. DEO 5W-40 and DME 15W-40 meet the following specifications.

  • API CJ-4, CI-4+, CF, SM, SN
  • ACEA E7, E9
  • Ford WSS-M2C171E
  • Mack EO-O
  • DDC 93K218
  • Caterpillar ECF-3, ECF-2, ECF-1a
  • Cummins 20081
  • Volvo VDS-4, VDS-3
  • MS 10902
  • MB 228.31
  • MTU Type I & II, Type 2.1
  • MAN 3275, 3575
  • JASO DH-2
  • Global DHD-1
  • Renault RLD-3

OE Series Synthetic Diesel Oil

The AMSOIL “OE” Series of synthetic diesel engine oils is AMSOIL’s moderately-priced offering. Available in 15W-40 and 10W-30 grades, OE diesel meets many of the same industry specifications as the Premium Diesel Oil Series at a lower price. This makes the OE Diesel Oils ideal for the oil change shop market and cost-conscious diesel owners. OE Diesel is also ideal for fleets that have a mix of older and newer diesel trucks and equipment. Here are the industry specs covers by the OE Diesel Series.

  • API CJ-4, CI-4+, SM, SN
  • ACEA E9
  • DDC 93K218
  • Cummins CES 20081
  • MB 228.31
  • CAT ECF-3, ECF-2, ECF-1-a
  • Mack EO-O Plus
  • Volvo VDS-4
  • MAN 3575
  • Renault RLD-3
  • MTU Type 2.1

AMSOIL Heavy-Duty Synthetic Diesel Oils

AMSOIL’s Heavy Duty Series of diesel engine oils are formulated for older diesel engines that do not have the latest emissions equipment or exhaust particulate filters. These oils do not meet the newest API CJ-4 specification, so they should not be used in 2007 and newer trucks.

An example of suitable applications would be diesel trucks made prior to the 2007 model year and require the API CI-4+ specification. AMSOIL Heavy Duty Diesel Oils provide extended drain intervals and the best possible wear protection for older diesel trucks and equipment.

If you have a mix of older engines as well as newer units that require an API CJ-4 oil, go with the Premium or OE Series shown above.

If your engine does not require the CJ-4 spec, the Heavy-Duty Series oils shown below are an excellent choice.

AMSOIL 15W-40 Synthetic Heavy Duty Diesel & Marine Motor Oil

This synthetic 15W-40 is AMSOIL’s workhorse for older diesels. This 15W-40 is capable of triple the oil change interval suggested by the manufacturer and delivers exceptionally strong wear control. Here are the industry specifications covered by 15W-40 Synthetic Heavy Duty Diesel & Marine Motor Oil.

  • API CI-4+, CF, CF-2, SL
  • ACEA A3/B3, E2, E3, E5, E7
  • Global DHD-1
  • JASO DH-1
  • Mack EO-M, EO-N
  • DDC Power Guard 93K214
  • Caterpillar ECF-1A, ECF-2
  • Cummins CES 20076, 20077, 20078
  • Volvo VDS-2, VDS-3
  • Mercedes-Benz 228.1, 228.3, 229.1
  • MAN 271/3275
  • MTU Type 2

AMSOIL Synthetic 10W-30/SAE 30 Heavy Duty Diesel Oil

Ideal for applications that require straight 30-weight diesel engine oil or 10W-30. This robust synthetic is capable of staying in service for up to 600 hours and flows down to -36°C. AMSOIL Synthetic 10W-30/SAE 30 Heavy Duty Diesel Oil covers the following industry specs.

  • API CI-4+/CH-4/SL, CF, CF-2
  • Global DHD-1
  • ACEA A3/B3, E3, E5
  • JASO DH-1 • Mack EO-M+, EO-N Premium Plus ’03
  • Detroit Diesel Power Guard 93K214
  • Caterpillar ECF-1a, ECF-2
  • Cummins CES 20076/20077/20078
  • Volvo VDS-3/VDS-2
  • Mercedes Benz 228.1/228.3/229.1
  • MAN 271/3275
  • MTU Type 2

AMSOIL Series 3000 Synthetic 5W-30 Diesel Oil

Long known as one of AMSOIL’s most powerful synthetic oils, Series 3000 5W-30 can be used in place of 10W-30, 5W-40 or even 15W-40 with no sacrifice in engine protection. The upside of using a 5W-30 is improved fuel efficiency, maximum power output and a -50°C pour point. This elite 5W-30 is an asset to any diesel engine that does not require the very latest industry spec. Series 3000 Synthetic 5W-30 Diesel Oil covers the following specifications.

  • API CI-4+, CI-4, CF, CF-2, SL, SJ
  • ACEA A3/B3, E2, E3, E5, E7
  • Global DHD-1
  • JASO DH-1
  • Mack EO-M, EO-N
  • DDC 93K214
  • Caterpillar ECF-1-a, ECF-2
  • Cummins CES 20076, 20077, 20078
  • Volvo VDS-2, VDS-3
  • Mercedes 228.1, 228.3, 229.1
  • MAN 271/3275
  • MTU Type 2