preheat

Hello – can anyone help me with a problem on my newly acquired 1994 W124 300E diesel? The problem is that the glow plug light on the dash does not come on until 30 seconds or so after the ignition has been switched on (and at the same time you hear the “clunk” as the relay kicks in). The car had...

Anyone have any experience of preheaters in a W124? I ask because they claim to offer improved fuel consumption on short journeys, 90% of the journeys my '91 230TE undertakes are of 4 miles or so (2 miles each way with a 20 minute stop in the middle), in fairly light suburban traffic but over...

I have no user hand book for my lovely 2004 W209 so can anyone tell me if I should turn on the ignition and let the glow plugs warm up for about 5 seconds before starting the engine, as with other diesel cars I have owned? I notice what looks like a pre-heat glow plug orange symbol in the...