Douglas beat Oldershaw 57-0 at Port-e-Chee to give them a much needed boost before the Christmas lay-off.
Andrew Evans bagged five tries as Douglas went on the rampage against struggling opponents.
There were also tries from Simon Heggs, Will Latta, Callum Carine and Bryn Snellgrove who also added six conversions.
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Manx rider part of national team competing in Chile next week
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British squad finishes third in series overall
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Manx racing organisations pay tribute to Ian Lougher career
Ten-time TT winner announced retirement earlier this week