Yeah I've checked oil, it was recently serviced by the garage I had it from. Also there seems to be several other things I've noticed - the is a noticeable click when I put my foot down on the clutch, and when I've driven for a while and pull off slowly (more noticeable when reversing) there seems to be a knocking coming from either the engine or transmission? It reminds me of the sound of worn engine mounts. I realise there are a lot of 'unique' noises the zed's are known for but it's making me paranoid! Also the brake pads sound as though they're rubbing under braking and can be quite noisy! Thanks guys