engine oil

noun

noun

Synonym of motor oil.

The rest were undergoing special underbody cleaning safety checks at TfW depots, after speculation that the cause of the incidents may have been a build-up of engine oil and combustible material such as fallen leaves and general detritus.2023 March 22, “Network News: Class 175s withdrawn for safety checks after fires”, in RAIL, number 979, page 13:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.