This paper present the results of experimental piston friction losses on stepped bearing surface microgeometry obtained on the test rig. This test rig is equipped with special temperature control system. which provides better stability to temperature than in standard systems. The results of station tests was discussed. https://safeersappliancers.shop/product-category/aeg-kpk842220m-compact-pyrolytic-self-clean-oven-in-stainless-steel/