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AMSOIL Releases Synthetic-Blend 15W-40 For Commercial Market

AMSOIL 15W-40 Commercial-Grade Diesel OilAMSOIL has released a brand-new semi-synthetic 15W-40 diesel engine oil. This product is called AMSOIL 15W-40 Commercial-Grade Diesel Oil. AMSOIL is best known for it’s full-synthetic product line.

Why Did AMSOIL Release A New 15W-40?

AMSOIL is looking to make a dent in the commercial market. Cost is king in this sector. Therefore, AMSOIL’s premium, full-synthetic diesel oils can be priced out of some markets.

This new semi-synthetic product was designed to be cost-competitive and still offer the exceptional wear protection that AMSOIL is known for.

What Is Notable About This 15W-40 Commercial-Grade Diesel Oil?

The main feature of this new product is that its base oil is comprised of over 50% synthetic oil.

Why is this notable?

This is notable because virtually all synthetic-blend diesel oils on the market have a base oil that contains between 1% and 15% synthetic oil. You read that correctly.

A dirty little secret in the motor oil industry is that there is absolutely no policing of what can be marketed as a “semi-synthetic” oil. While it may be implied (or assumed) that a synthetic-blend oil is “half” synthetic, this is almost never the case.

This product meets most all major industry standards including API CK-4.

Impressive Wear Protection And All-Season Performance

AMSOIL commissioned third-party wear testing for this new 15W-40 oil. In the Detroit Diesel DD13 test, AMSOIL 15W-40 Commercial-Grade Diesel Oil achieved wear numbers that were two times that of the minimum test benchmark. This test is designed to show how well a diesel oil will protect piston rings and cylinder bores.

The fact that this is product is a true synthetic-blend contributes to excellent all-season performance. An impressive cold-pour-point of -33°F (-36°C) makes for fast oil flow at start-up. This product also resists volatility boil-off and oil consumption in extreme heat.

Can Only Commercial Accounts Buy This Oil?

Anyone can buy this 15W-40 Commercial-Grade Diesel Oil from AMSOIL. It was intended for the commercial and fleet market. However, individuals, part stores and installers can certainly purchase this product as well.

Where To Buy AMSOIL 15W-40 Commercial-Grade Diesel Oil?

Oildepot can sell this product at wholesale in the United States and Canada. Request a wholesale price list using the form on this page.

Questions? Contact us at 1-800-748-5781.

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Duramax Diesel Engines: Can You Use 5W-40 Oil In Winter?

AMSOIL Signature Series Max-Duty 5W-40 Synthetic Diesel Oil A reader asks: I’ve got a 2018 GMC Sierra 2500 with the L5P Duramax diesel engine. I see that 15W-40 oil is suggested for this engine. Can I use 5W-40 in the winter?

Our answer: Yes, you can certainly use 5W-40 in winter (and summer) in your Duramax. While 15W-40 is suggested as the predominant viscosity for your engine, GM does recommend 5W-40 for temps below -18°C (0°F). AMSOIL’s official stance is that their 5W-40 synthetic diesel oils are safe and perfectly suited for year-round use under all conditions and loads. Naturally, 5W-40 is highly recommended for winter use, but there is absolutely no downside to using it in summer as well.

We offer two synthetic 5W-40 diesel motor oil options. The ultra-premium AMSOIL Signature Series Max-Duty 5W-40 and the value-priced AMSOIL Heavy-Duty Synthetic 5W-40.

Is There Any Advantage To Using 15W-40 Over 5W-40?

No. Remember that both 5W-40 and 15W-40 have a 40-weight viscosity. Note that both are offering roughly the same viscosity protection at operating temperature.

The main advantage that 5W-40 offers is faster oil flow during cold-starts.

It is true that 15W-40 has been the predominant diesel oil viscosity for decades. The reason that 15W-40 was a mainstay was its relatively slim spread between the winter weight (15W) and the operating temperature weight (“40”). With previous generations of motor oil technology, a wider spread between winter weight and operating weight (such as 5W-40) was more prone to shearing and thinning.

AMSOIL Heavy-Duty Synthetic 5W-40 Diesel Oil. Today’s motor oils (especially synthetic oils) have a much more linear viscosity across the temperature spectrum. As a result, they are much less prone to being too thick in the extreme cold or thinning out in extreme heat. Therefore, a good 5W-40 will provide flawless protection all year-round.

That is why a 5W-40 can now safely replace 15W-40 for year-round use.

What Is The Difference Between AMSOIL Signature Series Max-Duty and Heavy-Duty Diesel Oils?

Signature Series Max-Duty is AMSOIL’s most sophisticated formula. It delivers their absolute best wear control.

In the Detroit Diesel DD13 Engine Scuffing Test, Signature Series beat the minimum standard by 600%. Heavy-Duty Series beat the standard by 400%.

Signature Series Max-Duty is overbuilt for extended oil change interval capability. Heavy-Duty Series should be changed at the interval suggested by the manufacturer or by the oil life monitor.

Heavy Duty Series has a lower price tag. It was brought to market for commercial fleets, the installer market and value-minded consumers.

We can sell AMSOIL Signature Series Max-Duty and Heavy-Duty Series 5W-40 in Canada and the United States. Contact us using the form on this page for a wholesale price list.

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