Potassium permanganate (KMnO₄) is a strong oxidizing agent and should not be mixed with flammable liquids such as oils. Mixing potassium permanganate with oil can cause a vigorous exothermic reaction, leading to a fire or explosion. The heat produced by the reaction can ignite the oil, resulting in a rapid combustion. Additionally, the decomposition of potassium permanganate can release oxygen, further intensifying the fire.

Here's the chemical equation for the reaction:

2KMnO₄ + C₁₂H₂₆ (oil) → 12CO₂ + 13H₂O + K₂CO₃ + MnO₂

In this reaction, potassium permanganate acts as an oxidizing agent, transferring oxygen to the oil (C₁₂H₂₆), which is reduced to carbon dioxide (CO₂) and water (H₂O). The potassium permanganate decomposes to form potassium carbonate (K₂CO₃) and manganese dioxide (MnO₂).

To ensure safety, it is crucial never to mix potassium permanganate with flammable substances or organic liquids. Always handle potassium permanganate with proper safety precautions, including wearing protective clothing and working in a well-ventilated area. If a spill or contact with oil occurs, immediately dilute it with large amounts of water and seek professional assistance to safely dispose of the materials.