Cold starting your Mercedes Diesel – facts and fiction

Each year people ask me about how to start their Mercedes diesel engines in cold weather.  I usually end up dispelling myths in addition to giving advice.  I decided to write an article to look at some of these myths and back up some good advice with facts about how the starting systems in these cars are designed to operate.

For simplicity, I will use a 1983 300D Turbo diesel (123.133 with OM617a) as a basis for this article.  The same theory and functions apply to a wide range of Mercedes diesels from the 1970s through the 1990s.

Myth:  “When the preglow indicator goes out, the engine is ready for starting”

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Whats going on here?

Don’t worry, its still me.  I’m working on the site.  I’m using WordPress since I don’t really want to spend any more time setting this up than I have to.  And it makes it easy to copy all the old content into the new format.  Hopefully, I’ll actually use my website to share information again, as I did years ago.

I’ll get around to customizing the UI.

If this new format upsets you and you prefer HTML that looks like it was coded in notepad, click here.