These engine parts are from a teardown of an engine using an experimental low-HTHS viscosity oil. A visual inspection shows no noticeable differences in wear between it and the higher-viscosity oil.
The effect of ultrasound (US) on the shear viscosity of water-soluble polymers, polyvinyl alcohol, polyethylene glycol and polyacrylic acid, was studied in aqueous solutions with US exposure of 23, 43 ...