Bedrock 75W-90
SYNTHETIC AMT
FLUID, DT-12
Synthetic 75W-90 transmission fluid for DT-12 automated manual transmissions in heavy-duty trucks
Bedrock 75W-90 Synthetic AMT Fluid is a synthetic transmission fluid for the DT-12 automated manual transmission used in heavy-duty on-highway trucks. The DT-12 selects its gears and works its clutch on its own, so it calls for a fluid made for an automated gearbox rather than a general axle oil. This fluid lubricates the gears, shafts and bearings, carries heat out of the gear train and supports clean, consistent shifts.
It is made for the duty cycle these transmissions see: long highway pulls at steady speed, regional runs with frequent shifting, and heavy loads on grades in Gulf Coast heat. A 75W-90 grade flows at start-up on a cold morning and keeps its film when the transmission runs hot under a loaded trailer. The fluid also protects the transmission's internal parts against wear and corrosion between service intervals.
In the Bedrock lineup this is the fluid for DT-12 gearboxes. Trucks with Volvo I-Shift or Mack mDRIVE transmissions use Bedrock 75W-80, and Paccar or Eaton automated transmissions use Bedrock SAE 40. For the drive axles on the same truck, Bedrock 75W-90 Full Synthetic Gear Oil is the companion product. It comes in the 5-gallon pail, sized for a shop that services several trucks a week.
Sheets are sent by email on request.
Applications
- Heavy-duty on-highway tractors with the DT-12 automated manual transmission
- Long-haul fleets pulling loaded trailers across the Gulf Coast and beyond
- Regional and dedicated-route trucks that shift often in city and suburban traffic
- Heavy-haul and grade work where the transmission runs hot under load
- Vocational trucks with a DT-12 transmission working off-highway and at the job site
- Owner-operators who service their own DT-12 and want one fluid for the gearbox
- Fleet shops and dealers that service DT-12 transmissions on a schedule
Performance
- Lubricates the gears, shafts and bearings of the automated gearbox through every shift
- Flows at cold start and holds a protective film at full operating temperature
- Carries heat away from the gear train on long pulls under load
- Protects internal parts against wear, rust and corrosion
- Resists thickening and breakdown in hot service
- Supports smooth, consistent gear changes the way the transmission's controller expects
Specifications
Formulated for use where a 75W-90 synthetic fluid is specified for the DT-12 automated manual transmission. Full details are on the Product Data Sheet.
Typical properties
Typical properties for Bedrock 75W-90 Synthetic AMT Fluid are listed on the Product Data Sheet (PDS), available on request.
Packages and part numbers
| Package | Part number | Case pack | |
|---|---|---|---|
| 5-gallon pail | BED75W90AMT5G | Single |
Bedrock 75W-90 Synthetic AMT Fluid comes in one package: the 5-gallon pail.
Order by part number from your dealer → Where to Buy
More in Transmission Fluids
Bedrock 75W-80 Synthetic Transmission Fluid (Volvo I-Shift, Mack mDRIVE)
Synthetic 75W-80 transmission fluid for Volvo I-Shift and Mack mDRIVE automated manual transmissions
Learn more about Bedrock 75W-80 I-Shift/mDRIVE →Bedrock SAE 40 Synthetic Heavy-Duty Transmission Fluid (Paccar, Eaton automated)
Synthetic SAE 40 heavy-duty transmission fluid for Paccar and Eaton automated manual transmissions
Learn more about Bedrock SAE 40 Paccar / Eaton →Bedrock SAE 50 Synthetic Heavy-Duty Transmission Fluid
Synthetic SAE 50 heavy-duty transmission fluid for truck transmissions that call for an SAE 50 synthetic fluid
Learn more about Bedrock SAE 50 →Bedrock Full Synthetic Heavy-Duty ATF, Allison TES-668
Full synthetic heavy-duty automatic transmission fluid for Allison transmissions that call for TES-668
Learn more about Bedrock ATF TES-668 →Sizes and part numbers
| Product | 5 GAL |
|---|---|
| Bedrock 75W-90 Synthetic AMT Fluid, DT-1275W-90 AMT (DT-12) | BED75W90AMT5G |
| Bedrock 75W-80 Synthetic Transmission Fluid (Volvo I-Shift, Mack mDRIVE)75W-80 I-Shift/mDRIVE | BED75W805G |
| Bedrock SAE 40 Synthetic Heavy-Duty Transmission Fluid (Paccar, Eaton automated)SAE 40 Paccar / Eaton | BEDSAE405G |
| Bedrock SAE 50 Synthetic Heavy-Duty Transmission FluidSAE 50 | BEDCD505G |
| Bedrock Full Synthetic Heavy-Duty ATF, Allison TES-668ATF TES-668 | BEDUATF5G |
Swipe sideways to see every size →
Order by Bedrock part number from your dealer.
Frequently asked questions
Can I use this fluid in a transmission that is not a DT-12?
Use it where the transmission maker calls for a 75W-90 synthetic fluid for the DT-12 automated manual transmission. Other automated transmissions have their own requirements: for Volvo I-Shift and Mack mDRIVE, see Bedrock 75W-80; for Paccar and Eaton automated manual transmissions, see Bedrock SAE 40. When in doubt, check the maker's service manual or email [email protected].
Is this the same as the 75W-90 gear oil for my drive axles?
No. The grade is the same, but an automated manual transmission and a drive axle have different needs. Bedrock 75W-90 Synthetic AMT Fluid is formulated for the DT-12 gearbox. For drive axles, use Bedrock 75W-90 Full Synthetic Gear Oil. Keep the two pails on separate shelves so they do not get mixed up.
How often should I change the fluid in a DT-12?
Follow the transmission maker's service schedule for your duty cycle and load. Severe service, such as heavy haul or constant stop-and-go, usually calls for shorter intervals than steady highway miles. Typical properties for this fluid are on the Product Data Sheet, available on request.
Specifications and typical properties are stated on each product's data sheet; follow the equipment maker's service recommendations.
Equipment and specification names belong to their owners and identify the equipment the product is formulated for; they do not imply endorsement.
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Find a dealer
TTM Diesel in Houston stocks the line; more dealers are being added.
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Data sheets
A PDS and an SDS for every product, sent by email on request.
Read more →
Request a quote
Write to [email protected] with the part numbers and quantities.
Read more →Bedrock 75W-80 Synthetic Transmission Fluid (Volvo I-Shift, Mack mDRIVE)
Synthetic 75W-80 transmission fluid for Volvo I-Shift and Mack mDRIVE automated manual transmissions
Read more →