There's nothing worse for the DIY-agnostic car enthusiast than getting a phone call from someone asking what's wrong with their motor.

"Any idea why it won't turn over, mate?" "It wasn't making that knocking noise yesterday." "Should the sump have water in it?" You want to help, but armed with such scarce information and not being au fait with the mechanical intricacies of every car ever made, you can only do so much.