Two Four Zero Quad D,

MMM (Or anything else) in place of DIESEL Rated Oil WILL Exacerbate/Increase Bearing surface WEAR.
"Lubrication Dilution" is the name of that engine failure.

Howeveah,

Your Mercedes ,Your Pleasure...

Now, filling #1 (through the Injector Orifice) with MMM and allowing the engine to "SIT" for a couple of days
WITHOUT OPERATING,before Removing the MMM
by using the Starter
(WITH THE I.P. "STOP" LEVER LOCKED DOWN,and the Injector out of the Engine)
couldn't hurt.
(Lots if Rags,Blowing out all that MMM will make a horrid mess!)

Me,I'd be filling my cylinder with KROIL (Instead of MMM) ,If I suspected
and CONFIRMED "Stuck Rings".

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'84 300SD sold
124.128