Assertion: engine's oil | /r/CapableOf | lose viscosity
Facets:
Source sentences:
text: Periodically, the oil for the car must be changed, and the oil pan is drained and refilled to remove the older oil, which has lost viscosity and picked up impurities.
text: Burning oil can be caused by many things including engine wear, particularly if you've been using the wrong oil (too thin), using dirty oil (causes engine wear), or old oil (loses viscosity).