Treadwear
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course.
For example, a tire graded 150 would wear one and one-half (1- 1/2) times as well on the government course as a tire graded 100.
The relative performance of tires depends upon the actual conditions of their use, however, and may depart significantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate.
See also:
Engine Changes
Complete redesigns tend to bring the most dramatic changes, from the styling
to the mechanics. A few things have changed in the WRX drivetrain, but I fear
it's not enough. The 2008 model seems exa ...
Cooling system
Never attempt to remove the radiator
cap until the engine has been
shut off and has cooled down
completely. Since the coolant is
under pressure, you may suffer
serious burns from a spray ...
Replacement of brake pad and lining
The front disc brake and the rear disc
brake have audible wear indicators on the
brake pads. If the brake pads wear close
to their service limit, the wear indicator
makes a very audible scra ...