In Sept. 1999 and yesterday (7-18-02) on my 300SD turbo diesel, 1983, I had to replace glow plugs. The previous owner who had it for about 8 years never had to replace them (and the owner of its first 10 years or so, I don’t about its’ glow plug replacement history). The mechanic yesterday is trusted and has been providing reliable help on our vehicles for 10 years. They used Bosch plugs which he said M-Benz uses. The only habit I have that might be different than other users as a possible piece of diagnostic info., is that when there are wintry or cooler temps I quite regularly use the motor plug-in to pre-warm it, only about 15-30 minutes or so, (which I thought would be good for the engine but not the glow plugs?). Can you please advise me on this? It is very frustrating to have these kinds of repeated repairs when M-Benz is supposed to have a reputation of longevity and reliability.

Thanks, Peter Feneht

P.S. Another question is, do those magnets you can put on the fuel line actually increase power & mileage?