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Motor Vehicle Spark Plugs: Optimizing Engine Performance
3) Seal numbering system
THE 6 GUIDELINES ARE:
There are different types of spark plugs available on the market, each designed for specific engine types and operating conditions. The most common types are copper, platinum, and iridium spark plugs. Copper spark plugs are the most affordable and provide good performance for everyday driving. Platinum spark plugs offer better longevity and performance, while iridium spark plugs are the most durable and provide the best spark performance.
spark plug

2, oil seal lightweight, fewer supplies. Each type of oil seal is a combination of thin-walled metal parts and rubber parts, and its material consumption is very small so that each oil seal has a lightweight.
