These covers leak, all of them, they sweat oil.

And yes, I noticed that I have a nut missing from my motor mount. WTF, how did that nut come loose?

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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT

I would try the dealer. If you start trying to buy engine gaskets like those you will find you might have to buy an entire gasket set.

But the dealer can order up individual gaskets.

The nut likely just fell off. Over the years a lot of vibration can knock all sorts of stuff loose. See if you can find a hardware store that sells that size nut with a nylon locking thread.

And.... Check the bolt that holds the dipstick tube in. I have seen these work loose and all the oil will bounce out of the engine as you drive. If you have vibrated that nut loose on the engine mount it would be wise to check the others.

Yes dealer or classic center for those gaskets. those are water jacket covers. make sure to drain all the coolant before you open those up or you'll get a bath. careful with the allen head bolts, if you strip them ... not going to be fun if that happens

Not a fun job at all... ask me how I know. heat: dont be afraid to use some before stripping the bolts...

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MAKDUFF3

1975 300D, Feuerrot and Parchment interior

1971 220D (RIP)

Oil is NOT leaking from those plates. As mentioned, those are coolant ports. I wouldn't attempt to replace the gaskets unless they ARE leaking.IIf they are leaking then use gasket material to make new gaskets.

It looks like the threads on the mount stud are damaged. If you can get a nut to bite on them then using a large flat washer and a nylon insert nut should do the job. Test the threads using a regular nut first.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now

Thank you all very much for your answers and yes the bolt that holds the dipstick tube to the motor was loose. Apparently this was the source of the leak and the oil flowed around the two covers giving me the impression that these were the source of my leak. As for the engine mount nut, I found a few in my "nut stash".

Thanks again.

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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT

Leaks on this covers are often caused by the fact that the cover plate itself is rusted through.

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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.

A friend of mine once asked me to look at his 240D since the engine was off on its' power.

So we opened the hood and everything, and I mean everything, was covered in oil. But one thing stood out-- His dipstick tube was gone and so was the bolt that held it in.

Anyway, the engine was shot. You might not think that all the oil could bounce out of that little hole but it did, and once it was flying through the air the fan blew it all over the engine compartment.

Finding those 'oil leaks' and trying to deal with them might have been a blessing in disguise.