Back to the ruptured vacuum pump diaphragm, I had that happen on my 240D and it manifested as a big oil leak down the right side of the engine and traced to the air cleaner housing, which was full of oil that the vacuum pump had pumped in. Is it routed differently on a W115?

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.