This is not a problem, just a question. My 300d glow light has always come on for about 5-7 seconds when the car was hot or cold, and if it's real cold outside it may stay on for 10 seconds. Always starts fine and I figured it was the way it's suppose to be.
I have noticed on the 240d that the GP is a series system and uses the older "slow glow" plugs. When the car is cold it takes about 15 seconds for the glow light to go off, but when the engine is warm it goes off in about 1 second if you even see it at all.
My question, I was wondering if something is missing in the 300d that is letting the plugs glow when they are not needed, or is this just normal with the fast glow system?

Jim