Description
MA3I – Cummins 3089025 is an O-ring seal used on the lubricating oil thermostat/oil cooler assembly on Cummins ISX and QSX engines. Cummins service literature specifically identifies 3089025 as the O-ring installed on the lubricating oil thermostat threaded plug.
- Inside diameter: 2.185 in / 55.50 mm
- Cross section: 0.118 in / 3.00 mm
- Material: Viton
- Durometer: 75
- Application: ISX-series oil cooler/thermostat


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