Oily bilge water is illegal to discharge and signals an engine, transmission, or fuel-system leak. Find the source before the EPA, harbor patrol, or your insurance does.
What to Check
1
Engine oil seal
Front or rear main seals weep oil onto the pan. Wipe clean and run — fresh drips reveal the source.
2
Transmission seal
ATF on the bilge floor + reddish color = transmission seal. Common on older Hurth / ZF gearboxes.
3
Fuel leak
Diesel sheen smells different than oil. Check primary and secondary fuel filters and fittings.
4
Stuffing box / shaft seal
Old packing dripping water + a worn stern tube can mix oil into bilge water.
When to Call Us
We clean up the existing oil with absorbent pads, find the source, and replace the failing seal — usually in a single visit.