Adding phenolic aldehyde-amine type ashless agent in aircraft piston engine oil, working life of the oil is greatly increased without serious leadpaint corrosion.

• 添加酚醛胺型无灰剂于活塞式航空发动机润滑油中,可大幅度地延长其使用寿命而并不导致严重的铅漆腐蚀。