Just read the manual for the first time since I purchased my second hand TDI. Since I've had it the oil pressure /level light briefly comes on red at ignition for a matter of seconds - Should this be right? The manual states that " The warning lamp lights up for a few seconds as a functioanl check. If the warning lamp is red or yellow or flashes it indicates that the engine oil pressure or level is two low" Am I confusing myself, or is this manual wrong? What colour should it light up then if everthing is OK?