Mobil Delvac 1 ATF 668
Synthetic Heavy-Duty Automatic Transmission Fluid Approved for Allison TES 668
Mobil Delvac 1 ATF 668 is an advanced synthetic automatic transmission fluid designed for modern heavy-duty automatic transmissions. It is approved against the Allison TES 668 specification and is backward compatible for applications recommending Allison TES 295 fluids.
This synthetic ATF is formulated for demanding commercial vehicle service where transmission durability, shift quality, friction control, and temperature performance matter. Its synthetic base oil and additive system help support stable viscosity, transmission cleanliness, low-temperature fluidity, and protection against thermal breakdown in high operating temperatures.
Mobil Delvac 1 ATF 668 is a practical choice for fleets, service shops, and equipment operators maintaining Allison-equipped trucks, buses, utility vehicles, haulers, vans, and other heavy-duty applications that call for TES 668 or TES 295 fluid.
Key Benefits
- Approved against Allison TES 668
- Backward compatible for applications recommending Allison TES 295
- Fully synthetic ATF for heavy-duty automatic transmissions
- Supports smooth shifting and power transfer performance
- Helps maintain frictional properties over extended service
- Provides thermal and oxidation stability in demanding operating conditions
- Supports low-temperature fluidity for cold-weather operation
- Compatible with mineral ATF fluids in top-off situations
Recommended Applications
Mobil Delvac 1 ATF 668 is recommended by ExxonMobil for use in:
- Modern heavy-duty automatic transmissions
- Trucks requiring Allison TES 668 or TES 295 fluids
- Buses and commercial passenger vehicles
- Utility vehicles and haulers
- Vans and fleet vehicles
- Other equipment requiring Allison TES 668 or TES 295 fluid performance
Always confirm fluid selection against the transmission manufacturer’s service manual, maintenance schedule, and approved fluid requirements.
Allison Approval Information
- Allison TES 668
- Allison approval number: 668-10202021
- Allison approval number: 668-10212021
- Backward compatible for applications recommending Allison TES 295
Typical Product Characteristics
- Product Type: Synthetic automatic transmission fluid
- Color: Red
- Density @ 15°C: 836.2 kg/m³
- Kinematic Viscosity @ 40°C: 36.5 mm²/s
- Kinematic Viscosity @ 100°C: 6.85 mm²/s
- Viscosity Index: 154
- Pour Point: -54°C
- Flash Point: 233°C
- Brookfield Viscosity @ -40°C: 11,000 mPa.s
Why Choose Mobil Delvac 1 ATF 668
Mobil Delvac 1 ATF 668 is built for operators who need an approved synthetic ATF for Allison TES 668 applications, with backward compatibility for TES 295 service requirements. Its combination of synthetic base oils, friction control, oxidation stability, and low-temperature performance makes it well suited for commercial vehicles and fleet equipment operating across varied conditions.
Frequently Asked Questions
What is Mobil Delvac 1 ATF 668 used for?
Mobil Delvac 1 ATF 668 is used in heavy-duty automatic transmissions requiring Allison TES 668 or Allison TES 295 automatic transmission fluid performance.
Is Mobil Delvac 1 ATF 668 approved for Allison TES 668?
Yes. Mobil Delvac 1 ATF 668 is approved against the Allison TES 668 specification.
Is Mobil Delvac 1 ATF 668 backward compatible with TES 295?
Yes. The product data sheet states that Mobil Delvac 1 ATF 668 is backward compatible for applications recommending Allison TES 295 fluids.
What vehicles use Mobil Delvac 1 ATF 668?
It is recommended by ExxonMobil for modern high-performance trucks, buses, utility vehicles, haulers, vans, and other equipment requiring Allison TES 668 or TES 295 fluid.
Is Mobil Delvac 1 ATF 668 synthetic?
Yes. Mobil Delvac 1 ATF 668 is a fully synthetic automatic transmission fluid.
What color is Mobil Delvac 1 ATF 668?
The product data sheet lists the fluid color as red.
What is the pour point of Mobil Delvac 1 ATF 668?
The typical pour point is -54°C, based on ASTM D97 testing.
Can Mobil Delvac 1 ATF 668 be used to top off mineral ATF?
The product data sheet states that Mobil Delvac 1 ATF 668 is compatible with mineral ATF fluids, which can reduce concern in top-off situations. Always follow the transmission manufacturer’s service guidance.
