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Graph 3. Group I Dry TOST Results.


Lube-Tech


PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


No.120 page 5 Conclusions


The data shows that the AO system for the different base oils requires selecting the correct type and combination of AO. The data illustrates that using a combination of DTC tolutriazole AO provides the best performance from Group II base oils and long life in the dry TOST. From Table 2 we can see that the formulations 7 & 8 are the best performing oils which lasted greater than 10,000 hours with no discoloration, precipitation of solids or increase in viscosity. The sulphur & nitrogen chemistry of DTC/TD yields the best AO performance in the dry TOST testing with these Group II base oils.


The Group I base oils tell a slightly different story. In order to get the best level of performance, different additive chemistry types and treat rates need to be adjusted for optimal protection against oxidation.


Table 5. Group I Dry TOST results.


Graph 3. Group I Dry TOST Results 30 LUBE MAGAZINE NO.149 FEBRUARY 2019


Graph 4. Group I Viscosity Change Results


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