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:
New vehicle break-in driving – the first 1,000 miles (1,600 km)
The performance and long life of your vehicle are dependent on how you handle
and care for your vehicle while it is new. Follow these instructions during the
first 1,000 miles (1,600 km):
● ...
Spark plugs
It may be difficult to replace the spark plugs. It is recommended that you have the spark plugs replaced by your SUBARU dealer.
The spark plugs should be replaced according to the maintenance sched ...
When checking or servicing in the engine compartment while the engine is
running
A running engine can be dangerous.
Keep your fingers, hands, clothing,
hair and tools away from the cooling
fan, belts and any other moving
engine parts. Removing rings,
watches and ties ...