Lubrizol, there are many fundamental reasons why the OM471 test differs from the OM501LA engine test. “The launch of the OM471 engine generation brought many fundamental design changes from the predecessor OM501LA; with a move away from the V6 configuration to an in-line 6. Whilst there was a small increase in engine capacity from 11.9 to 12.8 liters, the piston material changed from aluminum to steel to allow the OM471 to operate with higher peak cylinder pressures and piston thermal loading to deliver much improved thermodynamic efficiencies”. Furthermore, on assessing the reasons for the inclusion of the OM471 in industry and OEM specifications and the potential impacts upon lubricant performance, Nigel states.
“The OM471 engine replaces the OM501LA in ACEA categories E4 and E8, as well as the Mercedes Benz Trucks DTFR specifications; this is a significant change in engine technology that now better reflects the latest generation of powertrain being used in-fleet. With increased cylinder pressures and higher piston and turbocharger temperatures, the engine lubricant needs to deliver much improved thermal and oxidative stability compared to the requirements of the OM501LA; ensuring that ACEA E4 and E8 oils deliver the performance required by Euro VI hardware”.
The OM471 test has also been added to key OEM specifications and includes pass/fail parameters that will drive lubricant performance even further than ACEA E8. Lubricant formulations will need to be adapted to meet increased requirements in the areas of piston cleanliness, oxidation performance, and turbocharger cleanliness.
Maximising the performance of next-generation lubricants OEMs are constantly striving for greater efficiency and improved combustion performance. This has implications for the lubricant. Changes to piston metallurgy or the distribution and configuration of the ring pack can significantly alter the environment of the lubricant. The changes that OEMs make are driven by a mixture of competition and legislation.
To meet the performance demands of ACEA E8, as well as underlying OEM specifications, lubricant technology and formulations must be adapted and tailored to deliver the robust performance that is expected. Whilst Euro VI hardware is becoming the driving force in the marketplace, change is on the horizon. The
next series of legislation that OEMs in the on-road sector must meet is Euro 7. The announced legislation further clamps down on NOx, PM, and PN, as well as introducing several new regulated tailpipe emissions.
With the arrival and introduction of ACEA E8, lubricant performance in Europe will be raised, which in turn will enable OEMs that are striving for increased emissions performance to meet the lofty challenges of Euro 7. ACEA E8 presents significant formulating challenges, according to Alexandra Mayhew, Technology Development Manager at Lubrizol.
“Due to the introduction of new tests, the OM471, Volvo T-13 and COAT, E8 lubricants require much greater oxidation stability, deposit control and aeration control than E6 lubricants.”
“The OM471 is a challenging, 600-hour durability test, which tests lubricants on a range of performance features like piston and turbocharger deposit control, oxidation stability, cylinder liner, valvetrain and bearing wear and oil consumption. Deposit control and oxidation stability are particularly challenging and require carefully selected types and levels of antioxidants, dispersants, and detergents. We found that E6 lubricants, or simply boosted E6 lubricants, don’t meet the OM471 requirements in all performance features and new formulating styles are needed.”
Lubricant performance is set to increase with the arrival of ACEA E8. With Euro 7 on the horizon, powertrain emissions performance must also increase. The lubricant will continue to be a key enabling factor in cleaner powertrain technology, with all industry stakeholders having to be ready for the transition.
Bibliography [1] ACEA. (2023, August 14). ACEA - Vehicles in Use. Retrieved from
https://www.acea.auto/files/ACEA-report-vehicles- in-use-europe-2023.pdf
[2] ACEA. (2023, August 31). ACEA Commercial Vehicle Registrations 2022. Retrieved from ACEA: https://www.
acea.auto/cv-registrations/commercial-vehicle- registrations-14-6-in-2022-5-1-in-december/
[3] ACEA. (2023, August 31). Fact sheet #1 – Euro 7: Productive or counterproductive for the environment? Retrieved from ACEA:
https://www.acea.auto/fact/ fact-sheet-euro-7-productive-or-counterproductive-for- the-environment/
360.lubrizol.com/Categories/Euro-7
LUBE MAGAZINE NO.177 OCTOBER 2023
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