AMSOIL has reformulated their Signature Series Fuel-Efficient Synthetic ATF to meet the General Motors Dexron HP specification. The new Dexron HP formulation will become available once the previous formula has sold off. The new Dexron HP formula is projected to be on sale some time in May 2016. AMSOIL Signature Series Fuel-Efficient Synthetic ATF will be a high-quality replacement for AC Delco Dexron HP Automatic Transmission Fluid.
About The Dexron HP ATF Specification
The “high-performance” Dexron HP automatic transmission fluid specification for is for Chevrolet, GMC and Cadillac applications equipped with the Hydra-Matic 8L90 eight-speed automatic transmission. The Dexron HP spec has characteristics such as a full synthetic make-up, low viscosity for optimized fuel economy, enhanced resistance to foaming and long service life.
The factory-fill product for the 8L90 is AC Delco Dexron HP Automatic Transmission Fluid which is sold at Chevrolet, Cadillac and GMC dealerships. A US quart bottle of AC Delco Dexron HP retails for between $20.00 and $25.00 in the United States and upwards of $42.55 in Canadian. We can sell the AMSOIL Signature Series Fuel-Efficient Synthetic ATF for a fraction of these prices. Contact us using the form on this page for more information.
About The GM 8L90 8-Speed Transmission
As the industry is trending rapidly toward 8-speed (and larger) transmissions, GM designed and built the 8-speed Hydra-Matic 8L90 automatic transmission for the 2015 model year. The two main attributes of this transmission are improved fuel economy and increased torque tolerance. This state-of-the-art transmission is found in conjunction with the “LT1”, “LT4” and “L86” 6.2-litre engines in the following GM applications.
- Cadillac Escalade/Escalade ESV (2015 and newer)
- Cadillac ATS-V (2016 and newer)
- Cadillac CTS-V (2016 and newer)
- Cadillac CT6 (2016 and newer)
- Chevrolet Camaro (2016 and newer)
- Chevrolet Corvette Z06/Z51 (2015 and newer)
- Chevrolet Silverado (2015 and newer)
- GMC Sierra (2015 and newer)
- GMC Yukon Denali/Denali XL (2015 and newer)
Like several other modern transmissions, the Hydra-Matic 8L90 eight-speed automatic does not have a top-fill plug or dipstick. Fluid can only be added through a plug on the lower side of the unit. We disagree with this trend as it is a barrier to do-it-yourself motorists who perform their own fluid checks.