Subaru Forester Manuals 2015 Forester Owner's Manual | Page 482

Maintenance and service/Replacement of wiper blades Washer Fluid Concentration Freezing Temperature 30% 10.48F (−128C) 50% −48F (−208C) 100% −498F (−458C) In order to prevent freezing of washer fluid, check the freezing temperatures in the table above when adjusting the fluid concentration to the outside temperature. If you fill the reservoir tank with a fluid with a different concentration from the one used previously, purge the old fluid from the piping between the reservoir tank and washer nozzles by operating the washer for a certain period of time. Otherwise, if the concentration of the fluid remaining in the piping is too low for the outside temperature, it may freeze and block the nozzles. CAUTION . Adjust the washer fluid concentration appropriately for the outside temperature. If the concentration is inappropriate, spraye @