Hey guys,


So my engine in my '84 300D has 150K on it, starts right away, good power, all seems pretty solid. Haven't ever gotten compression #'s on it. It has a bit of blow by, which I don't let bother me nowadays.

Anyway, I will be getting new injectors soon, and I had planned that when I got the new injectors and had them out, I would do a Marvel Mystery Oil soak in the cylinders. I've read a lot about people doing it, especially on here. Some have seen some decent improvement, some not much. Haven't read about any adverse effects of it yet.

I don't mind the car being down for a week, I was planning to do other stuff on it while it sat. However, in all the reading I did on it, I could not find a specific instructional procedure, so I was hoping to find at least one person who's done it and can answer some questions.

1. How much MMO do you use per cylinder? I want to say I read 1/4 cup, but I can't find where I read that.

2. I remember reading you have to turn the engine every so often. When they say turn, do they mean turn it over a couple times with the starter? Or like using a wrench to rotate the engine by hand?

3. How many rotations roughly should I do, and how often?

4. Once the week(5 or 7 days?) has gone by, and I'm ready to start the engine, do I need to try and suck the MMO out of the cylinders with a hand pump or something, or do I just start the car? I want to avoid some kind of hydro lock obviously.

I think that covers everything. Also, if anyone who has done this has anything they feel I should know, feel free to throw it in.

Thanks!

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1984 Mercedes-Benz 300D