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R
NBR rubber is above all resistant to oils, especially hydraulic oils, lubricants, petrol and other aliphatic hydrocarbons, diluted acids and lyes. Good physical values such as high friction resistance and ruggedness and good temperature resistance (-25 °C up to +120 °C, in part to -40 °C) give this natural rubber a wide range of uses.
When selecting spark plug wires and new spark plugs, it is essential to prioritize quality, compatibility, and performance specifications. High-quality spark plug wires should be designed to withstand high voltage and heat, ensuring reliable transmission of electrical current to the spark plugs. New spark plugs should be selected based on the specific requirements of the vehicle, including heat range, electrode design, and material composition, to ensure optimal ignition and engine performance.
BS
The perfect remedy for this is to use oil seal materials that are rated for the temperature of your application. Also, ensure that the elastomer is free from volatile constituents like waxes, plasticizers, etc.
What is an Oil Seal?

Preparation
Among the most common causes of oil seal failure are: