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Message: <blockquote data-quote="Schwepps" data-source="post: 475998" data-attributes="member: 3592">If it has no smell and your engine bay isn't very oily, then it's condensed steam. If it's only a small wisp when you open your oil filler cap or dipstick, and is not a plume and is not coming out of your exhaust as well, then it's the normal by-product of combustion and not due to a gasket leak of your coolant into your engine.How bad is the vibration - is your whole car shaking or only the engine? If only the engine, then it's how you'd expect a diesel engine to behave. If you're still unsure about all this, send it to a dealer for a checkup.A few other bits bro:- You shouldn't open the oil filler or coolant caps or pull out the dipstick when the engine is running. Modern cars run at very high pressures.- There are no longer acceleration strings (throttle cables?) in modern cars. It's all electronic and computerised controls. In fact in BMWs, there isn't even a butterfly throttle, as the throttle is controlled by the sophisticated valvetronics and double vanos variable valve lift and timing.- Coolant reservoir and 'water tank' are referring to the same thing, ie the coolant reservoir.</blockquote>