The Oberkirchenrat Oldenburg has microfilms of most of the Ev.-Luth. parishes of the former Granddutchy of Oldenburg and the Jeverland.
The period that is covered by these microfilms is from the beginning of the parish registers up to 1811/1822/1825/1835
(the concrete period differs from parish to parish).

Four examples:

JEVER  1591-1811
CLEVERNS  1632-1825
HOHENKIRCHEN  1648-1822
WIARDEN  1631-1835
 

The holdings of the Staatsarchiv Oldenburg (the so called "Zweitschriften" of the parish registers) begin in 1801 resp. 1825,
so that there is a good chance to access the whole parish registers until 1874/1875 with research at the Oberkirchenrat (until
about 1811/1825) and the Staatsarchiv Oldenburg.

The Oberkirchenrat Oldenburg has opening hours from Monday to Thursday 8 a.m. to 4 p.m. and Friday 8 a.m. to 1 p.m.
There is a need to get in contact with the Oberkirchenrat Oldenburg to fix a date for on-site research! The capacities are VERY LIMITED - they only have ONE microfilm reader!
You don`t need any appointment, but you need to reserve this machine by fixing a date!

The adress:
Oberkirchenrat Oldenburg
Philosophenweg 1
26121 Oldenburg
Germany
Tel.: +49 441 7701-260
      + 49 441 7701-261

Best greetings.
Jens Mueller-Koppe
HISTORICAL RESEARCH SERVICES, Germany
http://pages.vossnet.de/hrs
---------------------------------------------------------------------------------------------------------
The Staatsarchiv Oldenburg has opening hours Mo, Mi, Fr 8:00 - 16:00 and Tu, Th 8:00 - 18:30.
They require not an appointment for people wanting to do research.

The address:
Niedersächsisches Staatsarchiv
Damm 43
D-26135 Oldenburg

Phone:(0441) 9244-100