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Pressure:
What are Oil Seals? 6 Things DIYers Should Know
PTFE Oil Seals - A relatively new and exciting oil seal, the use of polytetrafluoroethylene means that they can withstand dry or unlubricated operations. With a massive thermal range of -130ºC to +200ºC and a strong resistance to chemicals, they are considered to be the future of rotary shaft seals.
Figure 2: Typically shaped oil seal and component nomenclature


aircraft spark plug. Over time, spark plugs can become fouled with carbon deposits, oil residue, or other contaminants that can affect their ability to generate a spark. It is essential to clean or replace spark plugs as needed to prevent these issues and maintain optimal engine performance.
On most cars you need to remove several parts to get at the seal.