■Viscosity-index improvers: These additives help your engine oil perform as intended despite temperature fluctuations.
ISO 6194-1 1)
Figure 6: Oil seals for cars
Choosing Quality Spark Plugs for Vehicles
The last step involves the actual pressing-in of the seal. There are tools and tool kits available that can help with seal installation. Their biggest benefit is that they apply a very uniform force to the seal case, eliminating the possibility of the seal seating in any way other than flush.
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