Table 3: Requirements
There are several options available when it comes to spark plugs for the MK7 GTI. Some popular choices include NGK, Bosch, and Denso. These brands offer a variety of spark plugs that are specifically designed for performance cars like the MK7 GTI. It's important to do your research and choose the spark plugs that are best suited for your driving style and performance needs.
mk7 gti spark plugs

Oil seal: get to know all the details about this component

In situations where the shaft has splines or an integral gear on the end, you’ll want to take precautions. These gears and splines often have very sharp edges that are quite detrimental to the seal’s integrity. You may use an installation sleeve that will allow the seal to slide past these hazards undamaged.
Also, sealant should never be used on the housing and the installation guidelines, as discussed earlier, should be followed.

The advantages are low friction and minimum power consumption, the possible use even in case of insufficient lubrication, operating range of -130º c to +200º c and much more: high chemical resistance and a low breakaway torque after standstill. Further, the PTFE, when heated, can” remember” its original form and return to it (phenomenon known as” plastic memory effect”).Therefore, this kind of seal do not need the old school metallic spring.
The allowable total eccentricity is the maximum total eccentricity at which the sealing edge can accommodate shaft rotation and retain adequate sealing performance. The oil seal's allowable total eccentricity is affected by the design of the oil seal, the accuracy of the shaft, and the operating conditions.