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Lube-Tech


PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


No.120 page 6


The traditional combination of HP and DPA appears to be the best AO combination for these base oils. No discolouration of any of the samples was observed but precipitation of solids and an increase in viscosity was observed in this long term dry TOST test using Group I base oils. From the data in Table 5 samples 11, 14 and 16 were the best performing formulations that lasted for more than 10,000 hours. The data also shows that the use of a sulphur-containing AO (DTC) appears to have no performance advantage in these formulations.


Future Work In future work, the AO treat rates in both the Group I and II base oils may be further optimised to determine the minimum amount needed to achieve the 10,000 hours dry TOST life. For Group II base oils, less than 0.4 wt% total AO treat rate and for Group I base oils, less than 0.6 wt% total AO treat rate should be explored for further cost reduction. Exploring other AO or multifunctional additives may add additional performance benefits or lower treat rates.


The Group II formulations saw some colour changes, while Group I formulations saw viscosity increase over the testing period. These are both signs that the base oils are breaking down over time which means that further improvements to the additive systems can be made.


None of these fluids were tested for friction or wear performance, so these properties should be determined in order to assess potential ancillary benefits of the DTC/TD AO system compared to the traditional ADPA/HP AO system.


It is possible that the sulphur content of the DTC/TD system may indeed contribute to improved friction & wear when compared to the ADPA/HP system.


LINK www.vanderbiltworldwide.com


LUBE MAGAZINE NO.149 FEBRUARY 2019


31


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