You may think you know everything there is to know about cars, but sometimes even experts can get it badly wrong. The guys and girls of What Car?, PistonHeads and Classic and Sports Car reveal their embarrassing car-care fails

Martin Port, art editor at Classic and Sports Car, spent a rainy weekend replacing a tired old engine with his new, custom-built one. The first problem arose when firing it up on Sunday evening: no oil pressure. A phone call to an MOT-tester friend and a bit of apparently trustworthy advice was followed by a worrying rattling noise on his way to work the next morning…

If you want to avoid your own embarrassing car-care fail, head to your local Ford Motorcraft centre