The black color of these spark plugs is a result of carbon buildup, which is a common issue that can occur over time due to normal engine wear and tear. This carbon buildup can negatively impact the performance of the spark plug, leading to misfires, rough idling, and poor fuel efficiency. It is important to regularly inspect and replace black spark plugs to ensure optimal engine performance.
Regular maintenance and inspection of the oil seal are essential to ensure its continued effectiveness. Any signs of wear or damage should be addressed promptly to prevent oil leaks and potential damage to the machinery or equipment.
When considering auto parts spark plugs, it is essential to prioritize quality, compatibility, and performance. Iridium spark plugs are known for their longevity and consistent performance, making them a preferred choice for discerning vehicle owners and automotive enthusiasts. The selection of high-quality iridium spark plugs for motor vehicles can contribute to optimized engine operation, improved fuel economy, and reduced maintenance requirements, ensuring reliable performance over an extended service life.


4. The sealing function of the oil seal is good and the service life is long. It has the certain adaptability to the vibration of the machine and eccentricity of the main shaft.
Shaft seals, dirt seals, grease seals, lip seals, and many other names are only a few of the many names given to oil seals. They are simple components used in rotary shaft machinery to keep oil from leaking and impurities like dust, dirt, and water out. However, an oil seal’s most crucial role is to safeguard all ball, sleeve, and roller bearing types found in rotating shafts. Additionally, the seals stop blending two fluids that shouldn’t mix, such as water and oil.
In conclusion, choosing the right spark plugs for your MK7 GTI is crucial for optimal performance and engine efficiency. Upgrading to high-quality spark plugs can improve throttle response, fuel efficiency, and overall engine performance. Brands like NGK, Bosch, and Denso offer a variety of spark plugs that are specifically designed for performance cars like the MK7 GTI. When choosing spark plugs, consider factors like heat range and electrode material to ensure you're getting the best performance out of your MK7 GTI.
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In general, oil seals should be selected in the order of priority indicated in Table 1.