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If your cat has ingested motor oil and appears sick, you should go to the vet right away. Don’t wait until after you’ve finished washing the oil off. The following signs are good indications that your cat has been poisoned by the motor oil:  Stomach-related symptoms including vomiting, diarrhea, drooling, or cries of pain when you touch its abdomen. Behavioral symptoms such as confusion, dizziness, lethargy, pawing at its muzzle, and/or difficulty walking. More severe symptoms like extreme difficulty breathing, loss of consciousness, or an irregular heartbeat. You will also notice greasy, dark material on its hair, coat, or paws, and you may smell motor oil. It’s likely that your cat’s collar has also been contaminated by the motor oil. This will need to be washed as well. Once you’ve removed it, set it aside to deal with later. Depending on the material, you can either hand wash your cat’s collar with dish soap and water or run it through the washing machine. Put your cat on a stable, flat surface. Keep your cat calm by speaking to it in soothing tones. Take the loose skin at the back of your cat’s neck in your hand and tighten your grip. Your hand should be close to the ears, and the ears should move back slightly when you close your hand.  This grip should help prevent your cat from biting or scratching you while you handle it. Never pick an adult cat up by its scruff, as this could injure the cat. thoroughly contaminated fur. If the oil is sticky or has caused mats to develop in your cat’s fur, you may need to clip it off. This is the fastest and most effective way to remove large amounts of motor oil. Without using pressure, lightly graze the electric clippers in the same direction that your cat’s fur lies.  Clip off only the matted fur without shaving down to your cat’s skin.  Do not use scissors to clip off the affected fur, as you may accidentally cut the cat. Only clip off your cat’s fur if you already have a pair of electric pet clippers at home that you can use immediately. It’s best to get the oil off as quickly as possible, so go to the vet if there are mats of oily fur you can’t remove. For smaller areas of motor oil or oily spots that remain after you’ve finished clipping, you can remove the oil with oil! Only use vegetable oil, as it's safe for cats to consume in small doses. Pour a small amount in your hand and rub the oil into the fur that’s been affected. Do not use other oil products (such as essential oils) on your cat. Transfer your cat to the kitchen sink. This will give you enough space but should also make it a little easier to control your cat. Cover your cat in warm water and then lather the soap into their wet fur. Rinse and repeat as many times as you need to completely remove all traces of both types of oil.  As you bathe the cat, check for any burns or scalding to its skin and any signs of skin irritation, such as redness or scabs. Be sure to use dish soap, as it contains degreasers that will remove the oils. Most regular soaps do not contain degreasers. Continue using the scruff hold to restrain your cat. Use a fluffy towel to get as much water as possible off your cat. Once it’s no longer dripping, keep it in a warm room until it’s completely dry. You can also try wrapping your cat in a blanket to keep it warm while it dries. If your cat hasn’t shown signs of poisoning after twelve hours, it’s likely that they’re okay. However, watch your cat for a full day and night to be safe. If your cat begins panting, coughing, or vomiting, call your vet right away.

Summary:
Look for signs of poisoning before you start washing. Remove your cat’s collar. Grab your cat’s scruff gently to restrain it. Clip off Cover the oily area with vegetable oil. Bathe your cat with warm water and mild dish soap. Dry your cat thoroughly and keep it warm. Observe your cat for 24 hours for signs of poisoning.