How can you tell if oil is oxidized on a dipstick?
How can you tell if oil is oxidized on a dipstick? Oxidized and contaminated oil will lose interfacial tension. A simple test for interfacial tension is to place a drop of used oil from the dipstick on the surface of water. If the oil drop spreads out over the water’s surface (instead of beading up like a new oil) it may be time for an oil change. What does a dipstick test for coolant look like? Lesson No. 5 - Signs of Coolant Leak Brown bubbles or a dried crusty-brown residue above the oil level line on the dipstick could...