General Motors (GM) Specifications

General Motors issues their own sets of requirements for service fill engine oils used in their vehicles. These specifications detail the viscosity grades and physical, chemical and engine testing that must be conducted in order to obtain an approval.

There are two separate specifications: dexos1™ for gasoline engines and dexos2™ for diesel engines. In Europe, dexos2™ is also used for service fill gasoline engines. All applications for approvals against GM’s dexos specifications are made through the Center for Quality Assurance (CQA), who administers the approval process on behalf of GM.

Lubrizol 360 Podcast: LSPI & Why Oil Specs are Changing

June 14, 2019

Lubrizol business manager, Martin Birze, and PhD chemist, Matt Gieselman, discuss LSPI and why oil specs are changing.

What You Need to Know About Second Generation dexos1™

July 02, 2016

General Motors’ (GM) proprietary dexos1™ specification for gasoline engines is entering its second generation.

New tests in the second generation dexos1™

July 02, 2016

General Motors (GM) has introduced the second generation of its dexos1™ specification.

Manual Transmissions Continue to Maintain Global Market Share

June 15, 2015

The manual transmission (MT) continues to be the leader, accounting for almost half of all global production.


Six New Engine Tests Defined

December 11, 2014

The proposed GF-6 specification will bring an unprecedented number of new tests. Here’s what you should know about each new test.