Symptom guide
Oil Leak Under Car
How to identify oil leaks, judge urgency, and describe the leak clearly to a mechanic.
Quick answer
Oil leaks commonly come from drain plugs, oil filters, valve cover gaskets, oil pan gaskets, or front/rear engine seals.
Most likely causes
- Loose or damaged drain plug
- Oil filter leak
- Valve cover gasket leak
- Oil pan gasket seep
- Engine seal leak
Basic driver checks
- Check oil level on level ground according to the owner's manual.
- Note fluid color and location under the car.
- Look for burning oil smell.
- Place clean cardboard under the parked car to locate drips.
DIY diagnostic path
- Do not crawl under a car supported only by a jack.
- Top up only with the correct oil type if level is low.
- Clean old residue before trying to trace a fresh leak.
- Stop driving if the oil pressure light comes on.
Common mistakes
- Assuming every dark fluid is engine oil
- Driving with oil pressure warning
- Over-tightening a drain plug
What to tell the mechanic
Tell the mechanic drip location, oil level change, smell, and whether the leak began after an oil change.