NAG1 Transmission Fluid

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Updated on July 25, 2023

The NAG1, or New Automatic Gearbox generation 1, is an automatic, electronically controlled 5-speed transmission designed as an overdrive with a high-speed ratio, commonly used for Chrysler products, like Grand Cherokees, Jeep Commander, etc. This transmission system requires a specific transmission fluid for its operation and overall performance.

Chrysler, as the most recognized user of NAG1 transmission, has established its transmission specifications, which is the ATF +4.  Since NAG1 is highly sensitive to fluid, there are only a few reliable transmission brands that you can use for NAG1 transmissions, like Valvoline, Mopar, and many more.

What type of transmission fluid does a NAG1 take?

Chrysler has specified to use of ATF +4 licensed products

There are a few transmission fluids you can use for New Automatic Gearbox generation 1 or NAG1 transmission. Chrysler has specified to use of ATF +4 specification as the transmission fluid for all NAG1 models. These ATF +4 brands ensure they meet FCA specifications for NAG1 and avoid any catastrophic damages to your vehicle which may void your warranty. If you want to check a complete list of ATF+4 licensed products, you may visit the Center for Quality Assurance.

What is the recommended transmission fluid brand for NAG1?

There are a few transmission fluids you can use for New Automatic Gearbox generation 1 or NAG1 transmission. Chrysler has specified to use of ATF +4 certified transmission fluids for all NAG1 models. These transmission fluids brands are tested in severe conditions to ensure it meets all FCA’s specifications for NAG1 models. These products can reduce component wear, provides exceptional friction-modifying properties, and provides consistent shift quality. Here are a few of the most prominent brands used for NAG1:

Valvoline ATF+4

Valvoline ATF+4 is a full synthetic automatic transmission fluid that meets the demands of FCA NAG1 models, such as Jeep Grand Cherokee, Dodge Caravans, Ram trucks, and Jeep Wranglers. It is engineered with a cutting-edge innovation that lessens foaming and oxidation, thus, preventing transmission breakdown and prolonging the life of the transmission system. It is also an all-all-weather transmission fluid that means you can use this in low or high temperatures.

Mopar ATF+4

Mopar ATF+4 is a Chrysler genuine OEM Dodge/Mopar factory fit part, specially formulated for Chrysler-built models. It provides a unique friction modifier for smooth shifting, extends transmission life, and prevents fluid breakdown.

Castrol Transmax

It is a fully synthetic oil suitable for both ATF and CVT models. It is also compatible with all Chrysler/Jeep and Fiat vehicles. It uses Castrol Smooth Drive Technology that ensures smooth transmission performance, oxidation resistance, and copper corrosion resistance.

Mobil ATF+4

It is suitable for Chrysler with NAG1 transmission engineered with special additives that provide proper frictional properties that ensure excellent driving performance. It is highly suitable for low-temperature and with reliable wear protection.

What are the cheapest transmission fluids for NAG1?

The cost of maintaining a vehicle is sometimes costly. Often high -quality transmission fluid is very expensive. But there are alternative brands that can be used to could fit your budget. Here are some of the cheaper brands than premium brands suitable for NAG1:

Walmart’s Super Tech ATF+4

Costs $5.86 per Quart, available in any Walmart store or Walmart’s online stores.

Valvoline Dexron VI and Mercon LV

Costs $5.47 per Quart, available in any authorized store of Valvoline.

Castrol Transmax ATF +4

Costs $7.88 per Quart, available in most automotive shops globally.

Valvoline MaxLife Multi-

A vehicle full synthetic automatic transmission fluid that costs $6.34 per Quart.

STP Mercon V Automatic Transmission Fluid

Costs $8.39 per Quart in Autozone

What NAG1 transmission fluid can I use for high mileage cars?

Castrol Transmax High Mileage Automatic Transmission Fluid

NAG1 transmission is highly sensitive to transmission fluid, especially when they are aging. Castrol Transmax High Mileage Automatic Transmission Fluid is one of the best transmission fluids for high-mileage vehicles with over 75,000 mileages. It provides special protection to lessen typical problems with a high-mileage vehicle, such as leaks, varnish & sludge formation, etc. It has additional seal conditioners to prevent leaks and extra cleaning agents. Moreover, it is also reliable in a low and high-temperature environment. It can be purchased on Amazon or any affiliated store worldwide. It is available in one-quart bottles and one gallon.

Where can I buy NAG1 transmission fluids?

You can buy at any automotive stores or online store like Amazon, Walmart, eBay, Autozone, etc.

It is not difficult to find transmission fluids that work with NAG1. It is usually available at online stores such as Amazon, Walmart, eBay, Autozone, and many more. You can also buy these recommended brands at different automotive stores worldwide. Just make sure the store you are buying from is legitimate. It is crucial to check the ATF+4 certification from the Center for Quality Assurance. You can also visit the Center for Quality Assurance website to check if a particular brand is licensed with ATF+4.