Had the oil changed and they said it didn't show on the dip-stick. Now it seems like the engine could be knocking a little. Could it be damaged? confused
Without oil the engine could be damaged, yes. Oil is essential to keeping your engine running and healthy.
An engine knock can be a sign of problems so get it thoroughly checked out.
Is it right dipstick? Have you changed it? If it is right dipstick which came with your vehicle then you need to add another litre of oil. Be sure before pouring oil there is no leakage in the engine where oil can be gone out. The engine can be knocking for many reasons including low oil.