The RAC over filled our engine oil putting in over 8 ltr when our engine only takes 5.2 ltr. They then sent my wife up the motorway with 55% too much oil. Second call out later when car display is saying engine oil level too high and my wife is directed to a local garage to have over 8 ltr drained and then the correct amount put in. The RAC mechanic was not even aware our car had a dipstick! Customer services offered not to log the second call out as it wouldn't effect our premium at renewal! This was their attempt at a gesture of good will. They also charged £50.00 for 3 litres of unnecessary oil. The second call out was to get them to sort out their error and negligent act of putting too much oil in! They then gave me 5 and a half hours to get a vehicle report to ascertain whether there has been any damage. The earliest I can get a garage to look is on Monday. They have now closed the complaint on the say so of a customer services executive. If management read this I think you need to be contacting me ASAP. It doesn't make good reading and I am am far from happy. Have since read this article. Overfilling the engine with oil causes more issues than you would expect. If you add excess oil in your car, the symptoms might not show up all of a sudden. But inside the engine, the crankshaft will be submerged in excess oil. Pouring excess oil into the engine would also invite more air into the engine chamber. I'm sure a company such as the RAC are aware of the dangers of over filli g oil. Shame on you!