No matter the PTFE machining techniques and other processes used in making mechanical parts, they tend to fail due to some reasons. The same thing applies to oil seals. When they are exposed to some factors, they fail. The factors are stated below alongside the solutions.
GVST
Rotary Wheel Of Auto Parts
The spark plug ignition coil works by converting the low voltage electricity from the battery into a much higher voltage that is capable of creating a spark across the spark plug gap. This high voltage is delivered to the spark plug through the ignition coil wire, which is connected to the secondary winding of the ignition coil.
Maintenance and Replacement of Spark Plugs
Car Engine Head Gasket: Importance in Engine Functionality
The perfect solution to this is to always use an oil seal that fits properly; the right size of the seal should be used. And in other cases, backup devices should be used to avoid the buildup of clearance gaps within the mating edges.

: prevents particles from reaching the sealing lip.
-80 °C to + 200 °C