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Surface topography of the specimens after a friction test at a nominal pressure of 6 MPa in (a) dry friction conditions (Sa = 0.876 µm, Ssk = −1.43, Sku = 5.56, Sp = 2.04 µm, Sv = 6.66 µm, Sz = 8.70 µm, Sa = 0.635 µm), and with (b) 5W-30 engine oil (Sa = 1.27 µm, Ssk = −0.698, Sku = 3.65, Sp = 3.47 µm, Sv = 5.38 µm, Sz = 8.85 µm, Sa = 0.965 µm) and (c) 80W-90 gear oil (Sa = 1.05 µm, Ssk = −1.36, Sku = 4.78, Sp = 2.46 µm, Sv = 5.88 µm, Sz = 8.34 µm, Sa = 0.782 µm).
