Most oil pollution results from minor spillage from tankers and accidental discharges of oil when oil tankers are loaded and unloaded. Other sources of oil pollution include improper disposal of used motor oil, oil leaks from motor vehicles, routine ship maintenance, leaks in pipelines that transport oil, and accidents at storage facilities and refineries.
| Source |
Percent of Total Oil Spillage |
| Natural seepage |
46 |
| Discharges from consumption of oils (operational discharges from ships and discharges from land-based sources) |
37 |
| Accidental spills from ships |
12 |
| Extraction of oil |
3 |
