I've searched, but found nothing. I'm wondering if the fuel injector pump has an oil resevoir built into it? My '72 220 d is a Euro so the manual is in German and I've yet to recieve my W115 repair manual. Here is the jist of the puzzle: on the injector pump, next to the manual priming pump, is a cap with OEL printed on it, does this mean that within the injector pump there is some type of oil resevoir? If so what type of oil should be used within? Any help will be appreciated.

__________________
1992 500SEL 25K
1995 E320 40K
1995 SL600 120K
2002 JX8 Sport 43K
2005 Volvo S40 95K
2006 Isuzu NPR 304K (Frankencamper)
2007 Crown Victoria 150K
2014 Smart Electric 20K