How To Clean Car Engine with WD40 – Step-by-step Guide!

Getting to know all the good praises regarding WD40, you might be wondering‘ can I clean my car engine with WD40’.

Well, why not? It’s a pretty effective solution that can help loosen the grease and old grimes.

Using the WD40 with a lint-free cloth and brush, you need to clean the surface. You only need to spray it on the rusted and greasy areas and brush the surface. And then, remove the grime with the lint-free cloth.

The 3 lines won’t be enough for some to try the whole process. So, I’m going to break down how to clean car engine with WD40 step by step today.

How To Clean Car Engine with WD40.

Using WD40 on car engine is super simple if you learn the basic procedure which will take around 1 – 2 hours. Here are the 5 steps to complete the task of cleaning your car engine.  

Step 1: Idle the Car for A Couple of Minutes.

Start the car engine only and gently trigger the brake pedal using your foot. 

Do this for 5 – 10 minutes. This will help the car to get hot which helps in cleaning the stubborn dirt and grease easily.

Turn off the ignition. 

Step 2: Disconnect the Negative & Positive Battery.

After warming the car, open the hood (bonnet) and secure it with the stud. 

Locate the battery area. 

Take out the negative terminal (black cap) of the battery after wearing the safety gloves and rubber slipper. To find the negative terminal, look for the small minus sign near or on the battery. 

Detach the positive terminal (red cap) of the battery. You’ll find it by looking at the plus sign near or on the battery.

Protect the negative and positive terminals using plastic caps like the MCIGICM Wire Nuts to avoid electric shock and protect the open wire. 

Bend down the stud and close the car hood.

Step 3: Cover the Electrical Components.

Take a big plastic wrap or cloth to cover the electrical components. 

Apply the duct tape to keep the plastic wrap in the right place.  

Step 4: Apply the WD40 To the Car Engine.

Grab a lint-free clean cloth and wipe out dust. 

Spray the WD40 spray (if you are looking for one, try the WD-40 110071) on the greasy areas for 3 – 7 seconds.

Let the surface be like this for 30 to 40 minutes. This will help moisture the part to loosen up the stubborn grime. 

Take a small brush and rub the surface to loosen up the stickiness. 

Remove the grease using a microfiber cloth and tissue paper. Be sure to rub it in a circular motion for the best cleaning experience.   

Again, spray the WD40 on hinges, latches, and other metal parts even if they don’t have grease. 

Wait for 30 to 40 minutes. 

Rub the surface with a brush and remove it with tissue paper. 

Let the surface dry completely.

Step 5: Connect the Negative & Positive Battery.

Open the hood. 

Remove the duct tape and plastic wrap. 

Take out the wire caps and insert the negative terminal into the car battery (minus sign). 

Do the same thing to insert the positive terminal on the car battery (plus sign).

Close the hood.  

Frequently Asked Questions

1. What can I use to clean oil off my engine?

You can use any penetrating oil like the WD40 or try applying the degreaser with a brush to wipe off the oily surface from the engine bay.

And then, gently remove the dirt with tissue paper. It will take 10 – 20 minutes at max to complete the task. 

2. Is it safe to spray your engine with water?

Yup, it is! You can add soap and water to the engine to keep it clean from oil and dirt (as the majority of the latest car allow that). However, do not use water on electrical parts like alternators, air intake, and sensors.

3. Will WD-40 damage an engine?

The WD40 usually doesn’t damage the engine. However, you can’t use this on a non-greasy or clean engine as it contains strong ingredients which can react. Use the WD40 only on the greasy and old engines.

Ending Notes

Maintaining a car engine in good shape is something anyone should not ignore. You might need to take care of it once in 6 months or 6,000 miles using a strong penetrating oil like WD40. 

As you now know how to clean car engine with WD40, hope you’ll continue to upkeep and avoid facing the grease and dirt causing issues under the hood. 

Be sure to follow the directions without skipping any part. And wear the safety equipment before starting. Hope the shared guidelines help you to cleanse the engine well. 

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