6 Best Transmission Fluid for Allison 1000

Reviewed By: Joses Peter

It’s wintertime, snowing already is making driving hard enough, then there’s another problem. The fluid you’re using for transmission tends to freeze and it’s making transmission rougher than it should be.

So, what to do now?

Trust me, this is a problem pretty much every driver unrivaled faces. Some know how to tackle it the right way, and others are looking for an answer. If you’re using Allison 1000, I’m hoping to help you.

Best Transmission Fluid for Allison 1000

There are a lot of problems that can occur if you’re not using the right fluid for Allison 1000 transmission. Other than fluid being frozen in winter, if the fluid is not compatible, it can cause overheating, vibration, burning smell, etc.

So, it’s important to get the best transmission fluid for Allison 1000. This is where I’ll assisting you. Give these a try for buttery shifting transmission and you won’t regret buying the kind of wrong fluid anymore!

Quick Comparison of Top 5 Allison Automatic Transmission Fluid

Valvoline Multi-Vehicle (ATF) Full Synthetic Automatic Transmission Fluid
★ OUR #1 PICK! ★
Valvoline Multi-Vehicle (ATF)
  • Size: 1-Gallon
  • Type: Automatic
  • Compatibility: Recommended for GM DEXRON-II, DEXRON-IIIm DEXRON-VI, Ford MERCON LV, Toyota/Lexus Type T, T-II, T-IV, WS, Honda/Acura, ATF-Z1, Nissan/Infiniti Matic-D, Matic-J, Matric-K, Matic-S, Hyundai/Kia SP-II, SP-III, SP-IV, SPH-IV, BMW 7045E, ETL 8072B, LA2634, LT71141, Allison C-4, Mercedes Benz NAG-1, Volvo 1161521, 1161540, 97340, 1273.41, and VW/Audi G-052-025-A2, G-052-162-A1.
  • Country of Origin: USA
  • Size: 1-Gallon
  • Type: DEX/MERC/Automatic
  • Compatibility: All Ford models 1983 to 1996 and for General Motors 2005 and earlier vehicles. Can be used in power steering applications where Mercon is required
  • Country of Origin: USA
ACDelco GM Original Equipment 10-9395 Dexron VI Automatic Transmission Fluid
ACDelco GM Original Equipment 10-9395 Dexron VI Automatic Transmission Fluid
  • Size: 1-Gallon
  • Type: Dexron VI/Automatic
  • Compatibility: Recommended for any vehicle manufacturer that calls for DEXRON-VI, III, or II(E).
  • Country of Origin: USA
Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC
Stone River Products Castrol TranSynd 668 Allison 2021
  • Size: 1-Gallon
  • Type: Full-synthetic automatic
  • Compatibility: Allison TES 668 approved.
  • Country of Origin: USA
Castrol TranSynd 668 ALLISON 2021 UPDATED SPEC
Castrol TranSynd 668 ALLISON 2021
  • Size: 1-Gallon
  • Type: Full-synthetic automatic
  • Compatibility: Allison TES 668 approved.
  • Country of Origin: USA

Reviews of Best Transmission Fluids for Allison 1000

Valvoline Multi-Vehicle (ATF) Full Synthetic Automatic Transmission Fluid

Do you want to give some love to your Allison 1000? I’m reviewing Valvoline transmission fluid, and our research tells us that it is indeed the best for your sudden crazy shifts! Let’s get more into the product then-

Valvoline Multi-Vehicle (ATF)

If you own a steam engine, Valvoline Multi-Vehicle ATF is the best oil for you. It’s been America’s favorite since 1866. The fuel is formulated the best for high-temperature engines.

Valvoline has been serving motorists in the United States for longer than any other motor oil brand. Valvoline has been developing products with our practical learning experience to assist car and truck drivers to achieve optimal productivity and a longer life for their engines for more than 150 years.

People who have used this lubricant find this magically useful. You’ll find it helpful as well, especially if you live in chilly areas. Also, it comes in very handy in the winter seasons whereas other fluids tend to freeze a lot.

This is one of the finest complete synthetic Trans fluids you’ve used before, and at this price, it’s a steal! Other brands will set you back three times as much and aren’t even close to as good as Valvoline MaxLife.

It will help maintain your automatic gearbox in good shape and will also help you lengthen the time between fluid changes. It will also extend the life of your transmission components compared to non-synthetic fluids.

If you’re tired of rough shifts, get this fluid right now! The car won’t jerk in the middle of the road and you’ll get buttery smooth shifts. There will be no slippage as well.


  • Seal conditioners with high efficacy to help avoid breakdowns in high-mileage transmissions
  • Maintain and preserve the elasticity of seals
  • To greatly boost transmission longevity, the Anti-Wear Tool was introduced
  • Engineered with a proprietary blend of base oils
  • Advanced additives to improve oil flow at low temperatures
  • Increased film protection at higher temperatures


  • You might feel vibrations more than you should
  • You have to maintain your vehicle very well before you start using this and expect the greater result


Do not like the way your car overheats or whines? It’s fine. But here I have a solution to your problem and that is Castrol fluid. Let’s get more into it.


For smoother transmission, get this Castrol 03520C Transmax. When you use it on your Allison, well it’ll take some time to adjust. First, you may feel no difference at all, then when you drive your car a bit, you’ll understand why this product is hyped.

This fluid increases friction durability, making things very easy for you during transmission. The shifting is smoother than ever!

Flush your fluid regularly, and with the result. By regularly, I mean that, refill every 30k miles of driving. It’ll make your experience better than before. It also helps with the occasional excessive vibrations. This fluid has a better way to prevent vibrations.

Want a fluid that can work at high temperatures? This is it. It’s known for its reputation for working even at a high temperature. For the price, this fluid is really a catch. You can easily afford it.

Although, make sure you’re providing optimum maintenance to your car. Also, make sure the compatibility of the fluid and your car checks out. If you’re not careful, it’ll be a waste of money.

Castrol for Allison is just perfect. I’m sure, you will not want to go back to using whatever fluid you were using once you get used to it!


  • Friction durability has been increased for improved transmission effectiveness
  • For city and highway travel, superior high-temperature protection is provided
  • To avoid viscosity rises, it has unrivaled oxidation resistance
  • Complete seal protection


  • If not compatible, you’ll notice the high temperature 
  • If not compatible, the vibration will increase

ACDelco GM Original Equipment 10-9395 Dexron VI Automatic Transmission Fluid

Used to using Dexron fluid but now want to switch? Don’t worry, I got you. This ACDelco 10-9395 will easily adjust if you used Dexron previously. It’s one of the best Allison transmission fluid Dexron vi out there, even police vans are compatible with this fluid.

ACDelco GM Original Equipment 10-9395 Dexron VI

The ACDelco DEXRON-VI ATF is the latest addition to the renowned DEXRON line of automobile Trans fluids. Even in harsh situations, it delivers more constant shift performance and degrades less over time. DEXRON-VI Automatic Transmission Fluid extends the life of automatic transmissions and improves their performance.

CVT (Continuously Variable Transmissions) and DCT (Dual Clutch Transmissions) contain specialized Transmissions lubricants, and ACDelco DEXRON-VI ATF is unsuitable for them.

Used Dexron fluid but not happy with it? Well, you’ll be glad to know that friction durability, viscosity stability, aeration, foam management, and oxidation resistance have all improved over earlier Dexron fluids.

Improved fuel efficiency and transmission life are also possible outcomes with the usage of this fluid. You will have to do proper maintenance though. It allows for longer drain intervals. Even in harsh situations, it provides reliable shift performance.

It’s a professional brand that can deliver the best output for your expectations. But if I become honest, the price is really low for its performance.


  • Backward compatible with prior Dexron ATFs, and may be used as a far substitute for older vehicles/transmissions that previously utilized Dexron fluids
  • Friction resilience, viscosity consistency, oxygenation and foam management, and oxidation resistance have all improved in comparison to preceding Dexron fluids
  • Improved fuel efficiency and transmission life are possible outcomes
  • Longer drain intervals are possible because of this feature. Even in harsh situations, it delivers reliable shift performance


  • It’s relabeled so you might not have confidence in this product
  • It may not be fully synthetic if that’s the trait you’re looking for in the fluid

Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC

Unlike the last one, I’m introducing a new fully synthetic transmission fluid. It’s totally approved for Allison. Let’s get more into it-

Stone River Products Castrol TranSynd 668 Allison 2021 Updated SPEC

Castrol TranSynd TES 668 is a high-performance, full-synthetic automatic transmission fluid designed exclusively for Allison Transmission on-highway automatic gearboxes. TranSynd 668 offers oxidative stability, anti-wear performance, and friction durability.

It also has TES 668 standard differentiators. This fluid can enhance anti-shudder and transmission friction durability. For TES 295 applications, the TES 668 standard is entirely backward compatible.

You’ll find this fluid as advertised to you. It is the best for Allison 1000 gear shifting. The transmission won’t feel rough at all, especially on high roads. So, get it right away! This fluid also provides gear protection, so change your gears frequently without any hazard.

This fluid won’t make your car shudder like it’s out of control. It’s corrosion-resistant. That means after a few turns of your car, you won’t see any brown discharge coming out of your car. The oil will not get thickened after some time because it’s oxidative-stable.

Well, that’s all about this fluid. One more thing you should know, this might seem pricey to you but I think that’s okay because it really is a quality Trans fluid.


  • It improves the protection of your gear
  • Anti-shudder resilience is enhanced
  • It provides long-term clutch friction durability
  • It’s high corrosion resistance and foaming
  • Excellent thermal-oxidative resistance reduces coatings and oil thickening


  • The price may seem high to you

Castrol TranSynd 668 ALLISON 2021 UPDATED SPEC

I’m down to our 5th recommended fluid. This is yet another Castrol fluid, just an updated version of our 4th recommendation. Do you know what makes it different from the 4th one?

Castrol TranSynd 668 ALLISON 2021 UPDATED SPEC

Well, I’ll be glad to inform you that Castrol Transynd 668 is also compatible with Allison 100. It’s because Allison transcends, just with a whole new label. But the fluid is exactly the same.

This fluid will not cause your automobile to shiver. It’s resistant to corrosion. Because the oil is oxidatively stable, it will not thicken with time.

This fluid is exactly what it says it is. It’s the finest for moving Allison 1000 gears. The transmission will not feel jerky at all, even on winding roads. So go ahead and buy it! This oil also protects your gears, allowing you to switch gears more frequently without risk.

That’s all there is to this fluid. Another thing to keep in mind is that this transmission fluid may appear to be expensive just like the 4th one, but I believe it is justified because it is high-quality transmission fluid.


  • It improves the safety of your gear
  • Anti-shudder endurance is strengthened
  • It provides long-term transmission friction stability
  • It has high corrosion resistance and foaming
  • It has superior heat resistance


  • It may be more expensive than you’d want it to be

Mobil 112810 Delvac Synthetic Automatic Transmission Fluid

And this is the last fluid I’m reviewing for you. Looking for a fluid-like transcend but that is too costly for you? Don’t worry, I got you. The Mobil 112810 right here is a lot cheaper than you would think it is.

Mobil 112810 Delvac Synthetic Automatic Transmission Fluid

So, let’s talk about it more. Are you annoyed with fluid getting frozen in the winter? But this fluid solves that freezing problem you got going on. It doesn’t freeze. And it also works great on the highway!

Tired of draining the fluid frequently? Use this fluid, it’ll last longer than all other fluids and fulfill your expectations. The draining period is longer with this one. This fluid is very clean and you will never feel the burning sensation from using this fluid.

Do you work hard on the transmission? No worries, other users feel good about this fluid on their Allison 1000. In fact, transmissions have never been smoother with this one. It won’t be rough or anything. So, for efficient transmission, this one is a must. It also works great in rough driving situations.

The price may seem a bit more to you than what the other fluids cost. But, if your vehicle is experiencing some difficult shifts, it’s time to change the fluid. The shifts will be buttery smooth, and during heavy load circumstances, they’ll fall roughly 25 degrees. You will use this fluid for the next service without a doubt!


  • Assists in the extension of transmission efficiency, smooth shifting performance, and fuel economy
  • Cleans transmissions to prolong their life and performance, even in extreme circumstances
  • Long transmission endurance and tremendous wear reduction
  • At temperatures of -54 degrees Celsius, it offers fast and dependable lubrication


  • It may seem a bit overpriced to you
  • Make sure the fluid is compatible if you’re not using Allison 1000

How to Choose The Best Transmission Fluid for Allison 1000

Well, you know a lot of people are struggling with this particular problem. It’s hard to pick the right one from countless available options. This is why I get one from our picks.

The fluid needs to be synthetic, compatible with temperature fall if you’re living in a cold area, and most importantly, has to give you the best transmission experience.

I strongly recommend Castrol, TranSynd, and Mobil fluid for Allison 1000 transmission.

How And When to Change Allison 1000 Transmission Fluid

This is an interesting question. This really depends on the vehicle, the fluid, and how you’re using it. There’s no limitation to it.

But make sure, the fluid doesn’t smell like it’s burned, it’s maintained properly and it doesn’t spill from the gear. In such a case, change the fluid.

FAQ About Allison 1000 Transmission Fluid

Can I use Dexron 3 in Allison 1000?

Since 2007, using Dexron 3 is not recommended use in Allison 1000.

How many quarts can Allison hold?

It depends from transmission to transmission. Allison 3000 transmissions can contain around 29 quarts of fluid, whereas Allison 4000 transmissions can handle about 48 quarts.

Should I flush my Allison Transmission?

It’s not recommended, however, it can be done in a safe way I believe.

Final Words

So, these are our recommendations for the 6 best transmission fluid for Allison 1000. By now you know what to expect in which fluid, take care of yourself and your transmission! You can make the best decision for your gear if you purchase one of the fluids recommended by us.

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