工程机械现场使用中正确管理和使用油（燃油、润滑油、传动油和液压油等）、液（冷却水和防冻液等）对于保证机械的正常使用，减少机械磨损与故障，延长机械寿命等具有重要作用。尤其80年代初进口的一批工程机械目前已进入故障期；近年合作、合资、独资企业生产的新型机械设备? Proper management and use of oil (fuel oil, lubricating oil, transmission oil and hydraulic oil, etc.), liquid (cooling water and antifreeze) in the field of construction machinery shall ensure the normal use of machinery, reduce mechanical wear and tear, prolong the mechanical life, etc. Has an important role. In particular, a batch of construction machinery imported in the early 1980s has now entered the phase of failure. In recent years, new types of machinery and equipment manufactured by joint ventures and wholly-owned enterprises have been put into operation.