[Crazy Dazz]

Not an Engine, but funny nonetheless.
True story. Mate had a old corolla, and he worked very close to ocean in Freo, so rust was becoming a problem.
Anyway, somebody (it might have been his dad) once told him that a good way to slow down rust, was to spray "fisholene" (treated fish-oil) inside your doors and guards.

So anyway, he's telling me he's done this but complaining about the stench, and asking if I know whether the smell will go away. I'm telling him that it shouldn't smell that bad, then the penny drops, he's not saying "fisholene" or even "fish oil" he's saying "fish emulsion" which is rotted fish guts you use as a liquid fertiliser. Sure enough he found it in the GARDENING section at Bunnings and sprayed it inside his doors with a spray-bottle.