Duo 2.5 Foreline Pump is slowly leaking oil

We have a Duo 2.5 foreline pump that was replaced in June of this year (2023). The previous Duo 2.5 installed had a sudden catastrophic leak, thus the replacement in June. The oil was filled up halfway and I set a marker with tape to monitor the level in mid August. It's already about halfway down the mark. This model unfortunately does not come with a oil mist filter. We do have a service contract but I'm not sure if I should just periodically vent the GC and refill the oil or call again and get yet another replacement. These pumps seem to fail quite often.

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