Noun
a thick fatty oil (especially one used to lubricate machinery)
Source: WordNetFinancial service providers act as the lubricating oil in the economy. They link consumers who want to invest their savings for a good return with companies who want to borrow on best terms for expansion. John Bruton
Advantages are that microturbines may be designed with foil bearings and air-cooling operating without lubricating oil, coolants or other hazardous materials. Source: Internet
Paint, varnish, lubricating oil, leather dressings, furniture polish, insecticides, and nitroglycerin are made from peanut oil. Source: Internet
Due to primitive carburetion and absence of a true sump, the lubricating oil was added to the fuel/air mixture. Source: Internet
"Normal" rotaries Most rotaries however, had normal inlet valves, so that the fuel (and lubricating oil) was taken into the cylinders already mixed with air - as in a normal four-stroke engine. Source: Internet
Water-cooled models use engine coolant to keep lubricating oil cooler, avoiding possible oil coking (destructive distillation of engine oil) from the extreme heat in the turbine. Source: Internet