They make a "fogging spray" for engines. I use it on my outboard every year before storage in the fall and then again before I start it in the spring. A shot through each carb. and then a shot through the spark plug holes. But, this should have been done before you ever tuned it over.

I suppose you could give it a shot through the glow plug holes. I'm not really sure though. The Mystery Oil sounds like a good idea as long as you are not overzealous with it.

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AJ

1985 300D (SOLD)