I think all IPs from 1974 on are engine lubed. There is a small oil feed line to the IP and the oil returns via the chain case.

If not there will be an overflow tube on the engine side and a red filler cap.

I'd fill it anyway -- far too expensive to trash due to lack of oil

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!