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Lube-Tech


The performance results of the TOST test for Group II oils can be seen in Table 2. Nine out of the ten systems (90%) reach 5,000 hours of service time with eight systems (80%) reaching greater than 10,000 hours of service time. Graph 1 shows the failure rate for each of the different formulations to reach the failure specification (>2.0 mg/KOH of TAN) and correlates well with the viscosity increase (Graph 2). It is apparent that the two worst performing systems are samples 1 and 6 which failed much earlier than the other systems and had an increase in viscosity. Both of these systems use HP and DPA which are the standard phenolic and amine type of AO. The difference between the two samples is the amount of the two AO that were used. It’s important to note that no benefit was seen when the total amount of AO was increased from 0.15 to 0.2 wt%.


Table 2. Group II Dry TOST results.


PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE


No.120 page 3


Graph 1. Group II Dry TOST Results.


Graph 2. Group II Viscosity Change Results.


28


LUBE MAGAZINE NO.149 FEBRUARY 2019


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