Your oil shouldn’t look ... the engine block, which cannot properly vent the crank gases, turning the fluid into a goopy, milky-white sludge that can't lubricate or cool. It looks like something ...

Over time, tiny contaminants invade the oil, like combustion byproducts, miniscule metal fragments from the engine, and a sludge created by the continuous cycle of heating up and cooling down.

How Does an Engine ... in a process that looks like this: As the piston moves downwards in the cylinder, the intake valve(s) open(s), and the vacuum created by the piston’s motion pulls the air/fuel ...