300E PCV Valve

New owner of a 1992 300E (Canadian model; 3.0 litre engine) and was wondering where the PCV valve is and what the change interval is? The car seems to be using oil at 1 litre per 1,000km. I don't know when the PCV was
last changed so I'd like to check it. Many thanks.
DD7 '92 300E 175,000 km

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