The invention relates to a lubricant spray system and to a lubricant application method for treating the inner surfaces of insertion and assembly aids in a packing station. In order to efficiently treat the the inner surfaces of hollow bodies with continuous openings with the lubricant spray using the lubricant spray system, a combination of related methods and systems of the lubricant application and use in a system with directly consecutive steps is required. The lubricant spray system (1), which is equipped with a suction device, comprises a spray station (2), a mounting station (4) and a spray station (3) between which an adjustment and sliding frame element (5), designed as an insertion and mounting aid, is arranged. According to the invention, after spraying the lubricant (20), the parts to be introduced into the hollow body openings can be subsequently inserted and slidingly moved (22) in a smooth and damage-free manner A particular area of application is the packaging of battery plate packs (13) in battery containers (14).