GM 88861800 Equivalent: 3 Safe Choices You Must Try

GM part number 88861800 is a manual transmission and transfer case fluid that replaced Dexron III in these specific applications. It’s the fluid used in a wide range of GM vehicles that include the Chevrolet Camaro (2011-2024), Corvette (2014-2019), Cadillac CT4 and CT5 (2022-2024), and the Chevrolet SS. It’s also the correct fluid for older manual transmissions like the Tremec T56 found in Corvettes and SSRs, as well as manual transfer cases in trucks and SUVs such as the GMC Sierra and Yukon Denali.

88861800 is a petroleum-based, partial synthetic oil that meets GM specification 9986252. You’ll also see it sold under the AC Delco brand as part number 10-4033.

When GM phased out Dexron III licensing, they reformulated it and gave it a new name: Manual Transmission Fluid. Any vehicle that previously required Dexron III for a manual transmission or transfer case should now use 88861800 (or 88861801 in Canada).

GM warns against the use of Dexron VI in place of 88861800 in manual transmissions or transfer cases. Using Dexron VI can cause increased gear whine, shifter vibration, and potentially fluid leaks. If 88861800 is unavailable, you can fall back on Dexron III, but Dexron VI is not suitable for these applications.

GM 88861800 Equivalent

Dexron III or Dexron VI?

If GM 88861800 fluid isn’t available, Dexron III is a suitable alternative, offering similar performance in lubrication and cooling.

However, Dexron VI is not a substitute for GM 88861800 fluid. Dexron VI was designed for post-2005 transmissions with different requirements. Using Dexron VI instead of GM 88861800 can result in vehicle component failure due to differences in chemical composition.

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GM 88861800 Fluid Characteristics 

Valvoline DEX/MERC (ATF) Automatic Transmission Fluid

Valvoline DEX/MERC (ATF)

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Valvoline ATF DEX/MERC is a mineral-based automatic transmission fluid that serves as an aftermarket equivalent to GM 88861800 for applications originally specifying Dexron III. It meets the GM Dexron III G specification, making it compatible with manual transmissions and transfer cases that previously required Dexron III or now call for 88861800.

This fluid uses a mineral base oil formulation with a high viscosity index (176) that provides protection across a wide temperature range. The viscosity rating is 7.2 mm²/s at 100°C and 35 mm²/s at 40°C, with a pour point of -42°C for cold-weather performance. It’s designed to resist breakdown and stick-slip even after extended use, thanks to a balanced additive system that protects against corrosion, oxidation, foam, and deposits.

Key specifications include GM Dexron III G, Ford Mercon, Allison C-4, and ZF TE-ML 05L, 09, 11A, 11B. While it’s primarily formulated for automatic transmissions, it can be used in some hand-shifted transmissions where Dexron III is specified. The fluid is also sometimes recommended as hydraulic oil or power steering fluid in certain applications.

Don’t be surprised if the fluid appears red when fresh. It’s packaged and sold throughout Europe, with typical properties including a flash point of 210°C and specific gravity of 0.859 at 15.6°C.

Compatibilities:

• GM Dexron III G
• Ford Mercon
• Allison C-4
• ZF TE-ML 05L, 09, 11A, 11B

Mobil 1 Synthetic Automatic Transmission Fluid

Mobil 1 Synthetic ATF

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Mobil 1 Synthetic ATF is a fully synthetic automatic transmission fluid that’s compatible with GM 88861800 applications requiring Dexron III. ExxonMobil rates this fluid at the Dexron IIIH and Dexron IIIG quality levels.

This is a multi-vehicle formula that uses a fully synthetic base oil with strong thermal and oxidation stability. The viscosity rating is 7.4 cSt at 100°C and 36.3 cSt at 40°C, with a viscosity index of 176. It maintains performance across extreme temperatures, with a pour point of -51°C and reliable lubrication down to -54°C. The Brookfield viscosity at -40°C is 10,040 cP, which provides prompt cold-weather performance.

Mobil 1 Synthetic ATF is designed to resist breakdown and deposits even under severe driving conditions, with enhanced long-term frictional properties that help maintain smooth shifting performance. It’s compatible with mineral ATF fluids and all common seal materials, which is useful for top-off situations. The flash point is 220°C, and the fluid appears red when fresh.

Key specifications and approvals include:

• General Motors Dexron IIIH, IIIG, IIE, IID, II, and original Dexron
• Ford Mercon and Mercon V
• Allison C-4
• JASO 1-A
• Voith H55.6335.3X
• MAN 339 V1
• Volvo 97340, 97341

Frequently Asked Questions

What is GM part number 88861800?

GM 88861800 is a petroleum-based, partial synthetic manual transmission and transfer case fluid that meets GM specification 9986252. It’s essentially Dexron III renamed as Manual Transmission Fluid when GM phased out the Dexron III product name.

Which vehicles use GM 88861800?

This fluid is specified for manual transmissions and transfer cases in vehicles like the Chevrolet Camaro (2011-2024), Corvette (2014-2019), Cadillac CT4/CT5 (2022-2024), and older models with Tremec T56 transmissions or manual transfer cases that originally required Dexron III. It’s also the correct fluid for 2007+ GM manual transmissions and transfer cases.

Can I use Dexron VI instead of 88861800?

No, do not use Dexron VI in place of 88861800. GM specifically warns that using Dexron VI in manual transmissions or transfer cases can cause increased gear whine, shifter vibration, fluid leaks, and potential transmission failure.

What are the key specifications of this fluid?

The fluid has a viscosity rating of 75W-80 (SAE J300 grade 15W-40) and is sold in 1-quart (32 fluid ounce) bottles. It provides excellent friction characteristics, prevents clutch stick-slip, and is compatible with clutch elastomers while offering good lubrication and shear performance.

What aftermarket fluids are compatible with GM 88861800?

Aftermarket equivalents include Valvoline ATF DEX/MERC and Mobil 1 Synthetic ATF, both of which meet Dexron III specifications. If 88861800 is unavailable, original Dexron III fluid can also be used as a direct replacement.

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Closing Notes

1. Kubota UDT Hydraulic Fluid Equivalent Explore how Kubota UDT hydraulic fluid serves as a reliable substitute for GM 88861800, ensuring optimal performance – Learn more.
2. John Deere Hy-Gard J20C And J20D Equivalent Discover how John Deere Hy-Gard J20C and J20D hydraulic fluids compare to GM 88861800 for excellent compatibility and efficiency – Read more.
3. Mobil Vactra Oil No 2 Equivalent Understand how Mobil Vactra Oil No 2 matches up with GM 88861800 for hydraulic systems and machinery – Find out more.
4. Mopar Coolant Equivalent [OAT & HOAT] See how Mopar OAT and HOAT coolants can be considered alongside GM 88861800 for similar high-performance applications – Explore here.
5. Ford Refrigerant and AC Compressor Oil Capacity Charts [With Oil Type Recommendations] Learn about Ford’s oil recommendations and see if they align with GM 88861800 equivalents for your needs – Discover now.