What are the best/worst penetrating oils around. I only ask a) cos its useful and b) cos my dad gave me some when I was little and ive still got it. It brilliant and smells like nothing ive seen ever again. He got it from his steel works and you only need a tiny spray of it. It is in a yellow paper wrapped tin.. any ideas as to what it could be?. Wow, two posts in one day, im chuffed.