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Driving without an oil filler cap: how bad is it?

December 1, 2022

Driving without an oil filler cap: how bad is it? In the short term it is annoying, in the longer term it is very damaging to your engine. In fact, engine oil is an essential component of an internal combustion engine. It keeps the rotating parts in the engine lubricated and protected.

Engine oil contributes to the optimal operation of your engine and extends the life of your power source. Therefore, it is wise to check the engine oil regularly, change it regularly and top it up as needed.

Where is the oil filler cap?

You refill engine oil at the top of the engine block. Once you open the hood, you can usually see the oil filler cap clearly marked. After refilling the oil, close the oil filler cap again. If you don’t, the oil can escape through this opening. With the engine running, the chances of that happening are life-threatening.

Driving without an oil filler cap: the consequences

Driving without an oil filler cap can have both short-term and long-term unpleasant consequences. This is because a running engine will release engine oil more quickly through the opening at the top of the engine block. If oil in the engine compartment contacts hot parts, it begins to smoke or smoke. Not only does this look alarming, but it can also smell quite bad. Also, oil can drip further down and leave dirty spots on the road surface.

Driving without an oil filler cap?

Do you observe that something is wrong under the hood? Then stop as soon as it is safe to do so. Open the hood and see how serious the situation is. Is the engine hot? If so, first wait until it has cooled down. Is the temperature under control? Then close the oil filler cap and schedule some time for a thorough cleaning. Did you lose the oil filler cap? If so, arrange for a replacement as soon as possible.

In the long run, motor oil affects plastic and rubber parts of your car. In fact, oil corrodes rubber and plastic. This means that hoses and other parts are weakened, with all the possible consequences. Quick cleaning is therefore a wise choice.


How do you clean an oil-stained engine compartment? Wipe away the worst gunk with an old cloth. Then get warm water and some soap, mix it in a plant sprayer and mist it over the engine block and other smeared parts. Let this soak in for a while and then gently spray off. Try to keep the water jet away from electrical components as much as possible.

In any case, it is important to avoid having insufficient engine oil in your engine. If it does, serious engine damage can result.