I have heard about using diesel grade oil before in a M103, but this is the first time that I have seen a reason. Zinc additive for the cams.

So what about the recommended plastic fantastic Mobil Uno?

I have used Pennzoil Dino/plastic blend in the past but next time around I may try a diesel blend.

I don't like those vacuum suckers either. Get a sump bolt with a magnet on it to hold the possible filings.