Abstract
Effects of doping crankcase lubricants with retrofit (supplementary) oil additives have been assessed in both a modified load capacity (microsample step loading seizure (SLS)) test in the four-ball wear machine and in pin-on-disc tests. Both tests confirm that, although increasing extreme pressure protection levels, organolead-based additive products completely inhibit the zinc dialkyldithiophosphate antiwear activity of commercially formulated oils. Direct friction coefficient monitoring in extended tests has also shown that friction increases signalling failure in the microsample SLS testing of various lubricants can be due to different lubricant behavioural transitions. Comparison of lubricant friction and wear behaviour of both doped and undoped oil in extended microsample SLS tests with that in pin-on-disc tests has provided a basis for interpretation of the former test results in terms of IRG lubrication failure transition diagrams.
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