Must spark plugs be replaced at a 4S shop?

[DiPeyton]

Spark plugs do not necessarily need to be replaced at a 4S shop; you can choose to go to an external repair shop or replace them yourself. Spark plugs are a crucial component of a gasoline engine's ignition system, which introduces high-voltage electricity into the combustion chamber, causing it to jump across the electrode gap to generate a spark and ignite the combustible mixture in the cylinder. Their components include: terminal nut, insulator, terminal stud, center electrode, side electrode, and shell. Methods to determine if spark plugs need replacement are: 1. Abnormal engine shaking during acceleration; 2. Vehicle idling shake; 3. Difficulty starting. The replacement intervals for spark plugs vary by material: 1. Nickel alloy spark plugs should be replaced approximately every 20,000 kilometers; 2. Platinum spark plugs should be replaced approximately every 40,000 kilometers; 3. Iridium spark plugs should be replaced approximately every 60,000 to 80,000 kilometers.