Hi Guys! How to investigate MB dealership job? They said that they changed one of my glow plug, but I doubt it. I came to dealership with no warning glow plug light and all of the sudden I should pay $256 bucks (I in Australia). Any suggestions?

You would think MB wouldn't take any chances! If you paid for the part they should give you the old one as evidence. Not exactly solid proof I suppose but at least something. Not sure if they would have these lying around.......

I understand how modern world of business is operating and I witnessed myself that not ones.