Learn all about Diesel Oil

Choosing the right diesel oil for your vehicle can be a very painstaking process. However, it is important to make the right decision to avoid costly repairs from engine damage. There’s a wide variety of Amsoil products to choose from for your car, ATV, truck, or marine vehicle, .

If you are more interested in learning about the different types of oil for gasoline engines, feel free to check out my article on the differences between synthetic oil and conventional oil.

AMSOIL Diesel Oil

Two Types of Diesel Oil

Originally, there was only one type of diesel oil – API CJ-4 diesel oil. However, two years ago manufacturers developed two different diesel oil types for certain applications.  API CK-4 oils are meant for off-road vehicles while API CK-4 and API FA-4 are for highway trucks.

Manufacturers created FA-4 oils to reduce greenhouse gas emissions, and improve fuel economy.  API FA-4 standards provide low-viscosity oils, which improve fuel economy. They don’t require vehicles to use as much energy to circulate oil while still protecting vehicle engines from wear.

Alternatively, API CK-4 oils were developed to solve the problem of high temperatures in off-road vehicles.  API CK-4 oils offer the same performance improvements as FA-4 oils.  However, the off-road market doesn’t place as much importance on fuel economy.  Therefore, CK-4 oils come in a wider range of viscosities in order to ensure engine protection in off-road vehicles.

Do not use FA-4 oils in off-road vehicles. While FA-4 offer fantastic environmental benefits, the low-viscosity nature of this type of oil may not offer sufficient protection when faced with the extreme temperatures present in the engines of off-road vehicles.

Additionally, both FA-4 and CK-4 diesel oils are available as synthetic oils. Amsoil synthetic diesel oils, such as Amsoil Signature Series Max-Duty Synthetic Diesel Oil 15W-40, offer more consistent performance than conventional oils due to the chemical refining process of synthetic oils.

Is Diesel Oil Superior to Gas Engine Oil?

Automotive vehicle owners may assume diesel oil is superior to gas engine oil for a variety of reasons.

First of all, diesel oils are often marketed as “heavy-duty” or “max-duty”.  This is due to the fact that they protect the hard-working engines found in trucks and off-road vehicles. This leads consumers to view them as better choices for their vehicles than gasoline engine oils.

Moreover, they often have better detergent additives. These additives help to cleanse oil impurities. Without these additives, oil can deposit these impurities onto vital engine parts, which can cause severe damage to engine components.

Lastly, consumers might find it easier to find thicker viscosity oils, such as Amsoil Heavy-Duty Synthetic Diesel Oil 15W-40, in diesel varieties rather than in gasoline oils.

In some cases, Amsoil diesel oil is more beneficial in place of Amsoil synthetic oil for gasoline engines. For instance, if your engine produces extreme horsepower, high-viscosity Amsoil diesel oil is beneficial. However, if you have a vehicle with its stock gasoline-powered engine, it may be best to use gasoline motor oil. Either way, there is an extensive list of Amsoil products to choose from.

Is it Safe to Use Diesel Oils in Gas Engines?

Maybe you have diesel oil that you don’t want to waste, or want a high-viscosity oil for engine protection purposes. You might be wondering if it is okay to use diesel oil in your gasoline engine.

One factor to consider is that diesel engine oils often contain additional additives such as detergents and anti-foaming agents, and have much higher SAE ratings – things that aren’t necessary to have in oils for regular gas engines.

Additionally, due to the higher compression ratios found in diesel engines compared to gas engines, diesel oils have to have additional detergents added to them in order to combat combustion byproducts found in diesel engines.

Gas or Diesel

Due to these factors, it may seem like diesel engine oils would not be safe to use in gasoline-powered engines. However, many Amsoil products comply with the needs of gasoline and diesel engines. As a result, it is generally safe to use diesel oils in your gasoline-powered engine.

However, if you choose to go this route, it is vital that you make sure that the oil you choose meets the viscosity and specification requirements of your vehicle’s engine. For example, if your vehicle’s owner’s manual indicates that your engine needs a 5W-30 oil that meets API SN guidelines, you must use a diesel oil that also meets these specifications. Amsoil oils will list these specifications on any oil’s product page. For instance, if you look at the product page for Amsoil Signature Series Max-Duty Synthetic Diesel Oil 5W-30, it says at the bottom of the page that it meets the specifications for API SN.

In short, while it is probably better to use oil specifically manufactured for gasoline-powered engines, it is generally safe, and sometimes beneficial, to use diesel engine oils in your gas-powered vehicle.

If you are interested in purchasing any Amsoil products, or have any further questions regarding diesel oil, feel free to visit BuyGreatOil.

AMSOIL Vehicle Lookup

Our Products