Blog / Spotting oil leaks

Fluids & Filters · 4 min read

How to Spot an Oil Leak Before It Becomes a Problem

A small oil leak caught early is a minor, inexpensive fix. The same leak ignored for months can mean a costly repair, or in the worst case, engine damage from running low on oil without noticing.

Where to actually look

Fresh oil spots on the driveway, especially in the same spot repeatedly after the car's been parked overnight, are the clearest sign. Looking underneath the engine with a torch, checking around the sump, oil filter, and rocker cover gasket, can catch a leak visually before it shows up as a puddle on the ground.

Common leak points

• The rocker cover gasket, a common and relatively inexpensive leak source on many engines
• The oil filter, if not tightened correctly at the last change
• The sump plug, similarly if not properly torqued
• Front or rear crankshaft seals, a more involved repair but a common source on higher-mileage engines

Why checking the level regularly matters more than it seems

An engine can develop a slow leak that isn't dramatic enough to leave an obvious puddle, but is still steadily losing oil between checks. Checking the dipstick monthly, and noticing if the level's dropping faster than it used to, often catches a leak before it becomes visible on the ground at all.

When a small leak becomes urgent

A leak that's slow and stable, with the level topped up regularly and staying roughly consistent, can often wait for a scheduled repair. A leak that's getting visibly worse, or one accompanied by a burning smell suggesting oil is dripping onto a hot exhaust component, is worth acting on immediately rather than waiting.