The aim of the paper was to observe the changes of three basic oils during the durability tests (mineral, ester oil and alkylated naphthalenes). During the research chosen basic parameters were investigated and also aging test of prepared oils in laboratory conditions was performed. After durability tests oil samples were extracted from the bearings and FTIR and TAN were examined. The best characteristics after aging test in laboratory conditions showed alkylated naphthalenes and than ester oil, but the smallest changes after durability tests were noticed for mineral oil.
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