P Metric
With the P-Metric system, Section Width is measured in millimeters.
To convert millimeters into inches, divide by 25.4. The Aspect Ratio (Section Height divided by Section Width) helps provide more dimensional information about the tire size.
Example:

(1) P = Certain tire type used on light duty vehicles such as passenger
cars
(2) Section Width in millimeters
(3) Aspect Ratio (= section height 7 section width).
(4) R = Radial Construction
(5) Rim diameter in inches
See also:
New Level of Comfort and Convenience in All Models
Standard comfort and available amenities are increased across the Subaru
Legacy line for 2010. The base 2.5i model, for example, features standard
steering wheel audio and cruise control buttons, ...
Audio control buttons (if equipped)
Type A audio
Type B audio
These buttons are located on the spokes of the steering wheel. They allow the
driver to control audio functions without taking his/her hands off the steering
wheel. ...
Recommended grade and viscosity
Use only engine oil with the recommended grade and viscosity.
Refer to “Engine oil”.
NOTE
Engine oil viscosity (thickness) affects fuel economy. Oils of lower viscosity provide better fuel econ ...
