Hear is the deal, my 83' 300D is for the most part running pretty solid. I recently had a few bad glow plugs that needed a little attention. About a month ago I replaced glow plugs 1 & 2, the rest of the seemed to read fine on the ohm meter. the first week was a little better, but I have noticed that compared to my partners 300TD, the glow plug light seems to stay on about half the time. (around 4 seconds) his is almost double the time of mine. My question is just a general conscious of the amount of time that the average glow is on this model. I notice that the cold start seems to not have much trouble, where as after the car has reached operating temp, it becomes harder and takes a few good hard cranks to restart. I have noticed quite an increase in the amount of coolant consumed over the past couple of months, I'm guessing some correlation for the extra cranking. Someone has told me that its all in the relay and that it needs to be replaced, but Ive noticed that there are really no posts for this topic. so.. if any can give some feedback it will be greatly appreciated. THanks