I asked attendant if it was ok to wash my car engine. He said it was rare to have problems, and gave instructions/ I blew a coil and had to get a mechanic to fix it, plus the miss firing of my engine caused the car to shake profusely for short time. After the initial shaking, I tried to dry it, but I think the coil had already blown. The mechanic said never to wash the engine and to use an air hose. What should I do under Australian Consumer Law?