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#5370 - 12/09/21 07:09 AM New GM dexos Gen 3 Oil Standard  
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dexos™1 Gen 3 is the latest generation of GM-certified engine oil.

The recently introduced engine oil specification addresses the challenge of meeting the needs of new engine hardware in particular, higher power density engines equipped with new technologies with enhanced oxidation, turbocharger protection and engine cleanliness.

The dexos1 Gen 3 specification (Fig. 3) is the new requirement for factory fill and service fill for gasoline engines, replacing the previous dexos1 Gen 2 specification. It’s backward compatible with all previous generations of dexos1.

dexos1 Gen 3 is currently available in 0W-20 and 5W-30 viscosity grades. Refer to the electronic parts catalog or acdelco.com for the most up-to-date applications and a complete list of engine oils.

TIP:
Viscosity recommendations vary according to temperature and engine manufacturer, so using the right viscosity grade oil is critical for proper engine performance. Always check the appropriate vehicle owner manual for the proper viscosity grade for the vehicle being serviced.

dexos1 Gen 3 features:

• High resistance to oxidation, keeping the oil from breaking down, to provide enhanced turbocharger protection and engine cleanliness
• Fuel savings and prolonged engine life by fighting wear and reducing friction
• Easier starts and better engine protection in cold weather, stop-and-go driving and towing heavy loads
• Cleaner engine operation by resisting varnish and sludge that can affect performance along with upgraded performance limits for deposit and sludge tests

Next Generation

The dexos1 specification, introduced in 2010, was designed to further improve fuel economy and fuel economy retention, which allows the oil to maintain its fuel economy benefits throughout the life of the oil, while also providing a more robust formulation for added engine protection and aeration performance.

The enhanced specification also supports GM’s Engine Oil Life System (EOLS), minimizing the use of engine oil, and reduces the duplication of requirements for numerous internal GM engine oil specifications.

In addition to the new dexos1 Gen 3 specification, the International Lubricants Standardization and Approval Committee (ILSAC) recently introduced the GF-6 engine oil performance standard, which aims at meeting changing industry demands of improved fuel economy and engine protection.

Most of the dexos1 Gen 3 tests have significantly higher limits than ILSAC GF-6. In addition, dexos1 Gen 3 has its own specified engine tests to evaluate low-speed pre-ignition mitigation, fuel efficiency, oxidation, and turbocharger deposit performance and wear protection.

Along with the GF-6 tests, many Gen 2 tests are carried over to Gen 3, including a test for turbocharger deposits at tighter limits. Gen 3 also includes an updated stochastic pre-ignition (SPI) test, compared to the limits for Gen 2, as well as a new fuel efficiency test.
In addition, the specification has eliminated most European tests.

dexos1 Gen 3 Availability

The newly formulated dexos1 Gen 3 product is now available in bulk through the GM Oil Program.
The transition from the current dexos1 Gen 2 to Gen 3 will be a running change and as the old product is sold down, new product will be supplied.
Pricing for both formulations is the same.

For additional program details, refer to GlobalConnect message GCUS-9-12087.



Attached Files dexos3.jpg

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#5371 - 12/10/21 02:41 PM Re: New GM dexos Gen 3 Oil Standard [Re: teamzr1]  
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A General Motors official unveiled details last week of the looming upgrade to the companies passenger car motor oil specification. After previously saying it would release Dexos1 Gen 3 in January and begin commercial licensing during the second quarter, the company is considering revising the schedule to push back at least some timing and plans to announce a decision soon.

Speaking at the ICIS Pan American Base Oils & Lubricants Conference in Jersey City, New Jersey, GM Power Train Vehicle Fluids Technical Specialist Khaled Zreik said GM made significant changes to align with ILSAC GF-6, the North American auto industries specification scheduled for commercial launch in May. Gen 3 includes most GF-6 engine tests, but also has additional requirements that could complicate work for oil marketers wanting to offer products that meet both specs.

Dexos is the most important original equipment manufacturer passenger car engine oil specification in North America, and Dexos1 Gen 3 is GMs update to Dexos 1 Gen 2, which was launched in 2017.
In October, GM said it aimed to unveil the new spec in January, begin licensing during the second quarter and require all products promoted as meeting its spec to transition to Gen3 by Aug. 31 of next year.

Lubricant formulators had raised concerns about whether the industries testing infrastructure would allow lube marketers to obtain approvals within that timeframe. Zreik said GM heard them and is now making a revised schedule that will be announced soon.

The timing for GMs new spec also concerns industry players for a second reason. Many lube marketers offer engine oils that meet both GM’s standard and the latest ILSAC spec. With GF-6 scheduled for commercial launch on May 1, many GF-6 and Gen 2 programs are already complete or near completion.
Some additive companies and oil marketers have worried that changes to the Dexos standard could impact products already in the pipeline.

Zreik said that General Motors is not satisfied with the industry’s ability to keep up with technical challenges that fluids may need to address with new hardware. He confirmed that SAE 0W-20 will be GM’s viscosity grade of choice for the foreseeable future for internal combustion engines, which will coexist with battery electric vehicles. Internal combustion engines are trending smaller, while maintaining the same performance as larger previous generation engines. Fluids remain an integral part of GMs drive to improve fuel economy and lower emissions to meet government standards and corporate goals.

Zreik said Dexos1, Gen 3 includes all the new GF-6 engine tests with the exception of Sequence IIIH. The latter is replaced by the GM oxidation and deposit test. GM’s test will be stricter, allowing viscosity to increase no more than 75 percent during the test.

The Sequence VH sludge test will also have significantly higher limits than ILSAC GF-6. Although the low speed pre-ignition sequence IX test is included, it is only rate and report for the GM specification. In addition to the GF-6 tests and its own oxidation and deposit test, GM will carry over many Gen 2 methods, including a test for turbocharger deposits at tighter limits.

GM tightened limits on the Gen 3 LSPI test compared to the limits for Gen 2. Gen3 also includes a new fuel efficiency test using a Chevrolet Silverado and a new bench wear test. Definition and requirements for the fuel economy test and wear test are still being finalized. Finally, the specification has eliminated most European tests with the exception of the M271 sludge test, which will also carry over.

In addition to engine tests, changes are being made to some key bench tests and rules for running programs, Zreik said. Notably, the Noack volatility limit will be changed from 13 percent to an average of 12.5 percent on three test runs.
The sulfated ash limit will change from less than or equal to 1 percent to 0.9 percent.
Each of these can have a significant impact on the formulation, changing the base stock mix especially for the SAE 0W-20 and potentially causing additive companies to modify the detergent inhibitor package to meet the sulfated ash requirement.

GM noted that its specification reduces sulfated ash to protect the catalyst and lower particulate emissions. GM will retain or tighten base oil interchange, viscosity grade read-across or other rules and expects to grant fewer exceptions than it did for Gen 2 approvals.

Zreik said GM has also started to work with customers to update Dexos1 licenses and will add Gen 3 by addendum.
Expected changes will include volume reporting requirements and potentially higher fees, although no public information is available on licensing and royalty fees. GM found that 48 percent of marketer labels contained errors that need to be corrected. Marketers who violate requirements can lose their license.

GM dexos1 Gen 3 is designed to address the challenges of smaller, higher-powered, (included having boost like turbochargers) engines

GM raised the bar for motor-oil-performance standards with its proprietary dexos1 Gen 3 motor oil specification. Engine downsizing, improved power density, forced induction, multi-point fuel injection, cylinder deactivation and emissions systems are all driving demand for more advanced lubricants.

The new dexos1 Gen 3 specification is designed to address the challenges these smaller, higher-powered engines present.

GM dexos1 Gen 3 highlights include…

Updated performance standards for deposit and sludge control
Revised stochastic pre-ignition (SPI) test
Fuel-economy test with backward compatibility with previous GM specifications


Find more information at

GM dexos

Attached Files dexosgen3.jpg

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#5372 - 12/10/21 03:11 PM Re: New GM dexos Gen 3 Oil Standard [Re: teamzr1]  
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Dexos1™ Gen 3 is a global engine oil specification introduced by General Motors (GM).

The new specification is designed to meet performance needs of GM vehicles and includes a more recent version of the stochastic pre-ignition (SPI) test, fuel economy test, and upgraded performance limits for deposit and sludge tests.

There is some overlap with dexos1 Gen 2 when compared to the latest industry standard, ILSAC GF-6, but dexos1 Gen 3 still has enhanced oxidation, turbocharger protection and engine cleanliness. GM has set a mandatory transition date of January 1, 2022, to meet its dexos1 Gen 3 specification.

Attached Files gen3guide.jpg

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