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Next to contact breaker, spark plug is among the most weakest part of the ignition system. It is mounted within the combustion chamber from the engine, where working conditions are- severe. During peak combustion conditions the temperature inside the combustion chamber in the modern car engine may be around 2500 ºC and the pressure about 7 Mpa. Moreover a spark plug can also be exposed to thermal and load cycling fatigue on account of sudden changes in temperature and pressure-from the high temperature of burnt gas on the relatively low temperature with the air/fuel mixture and from the ruthless during the time of explosion from the air/fuel mixture to low pressure during induction. In addition, the spark plug needs to endure high voltage, mechanical vibration along with the corrosive atmosphere of combustion gages. A modern spark plug posseses an economical life of about 10,000-16,000 km. The average advertised price to change 4 tires is $400 to $600 to the top tire size sold. Even $1000 isn't impossible. Insuring that you get the most mileage through your tires is important. Tires include the link between the vehicle as well as the road, and so are constantly subjected to the forces of acceleration, stopping and turning for a vehicle that weighs around over 4000 lbs.! Of course you?re likely to see tire wear, though the longer you can create your tires last, the less cash you will spend maintaining this section of your motor vehicle. Keeping your tires in good shape requires not only keeping an eye on tire wear and air pressure. It also means practicing safe driving habits, avoiding bad habits, and looking after every one of the the different parts of the steering and suspension systems