A real world oil analysis data set from 60 diesel engines on mining haul trucks. The data is fully described in the following paper. Please cite this paper if you use this data in a publication.

Phillips J, Cripps E, Lau JW, Hodkiewicz MR. Classifying machinery condition using oil samples and binary logistic regression. Mechanical Systems and Signal Processing. 2015 Aug 1;60:316-25.

Required data set citation is https://prognosticsdl.systemhealthlab.com/ and the date you accessed the data.

The paper is behind a paywall at https://www.sciencedirect.com/science/article/pii/S0888327014005093 but can also be accessed through ResearchGate.