On October 1, 2018, a special fluid specification (GMNA-9986555 [27]) was introduced for a revised "Dexron Approved" Mobil 1 Synthetic LV ATF HP. This revised fluid was introduced in GM Technical Service Bulletin 18-NA-355 in December 2018. The revision is to help correct a torque converter clutch shudder in the GM 8L90 and 8L45 automatic transmissions after a complete flush of the system.

Ford released the new Mercon V Fluid Specification in 1996; GM released the Dexron-III (G) Fluid Specification (GM6417M) in 1998; and Chrysler released the MS-9602 Change C Fluid Specification in 1999.https://www.sae.org/publications/technical-papers/content/740053/ Dexron-II Automatic Transmission Fluid Performance

Redline Oil product description of D6 ATF". Webcitation.org. Archived from the original on 2012-12-26 . Retrieved 2013-12-27.The fluid specification for Dexron-ULV (ultra-low viscosity) was introduced on January 2, 2014. Dexron ULV is composed of a Group 3+ base oil and additives needed for the proper operation of the 2017 and above GM 10L90 and the Ford 10R80 10-Speed rear-wheel-drive automatic transmission. Carry passengers and cargo within the recommended limits on the Tire and Loading Information label. https://www.sae.org/publications/technical-papers/content/2006-01-3242/ General Motors DEXRON®-VI Global https://cdn.opieoils.co.uk/images/variants/icon/motul/motul-dexron-iii-atf-automatic-transmission-power-steering-fluid-1-litre-5.jpg