Ambersil low surface tension penetrating oil ambersil 30240 aa p ambersil low surface tension penetrating oil is a high grade lubricating agent based on a mixture of oils and penetrants in a blend of solvents it has been formulated to offer quick and easy removal of seized and rusted components p p the penetrating oil is ideal for freeing nuts bolts screws studs pins valves machine parts pipe couplings and pulleys it can also be used for cleaning rusted surfaces of moulds dies a