Vinegar, dilute acids will all work .... however they will also remove metal. Better to use products: Mar-Solv or Ryd Lyme to dissolve the scale but not the metal componentry.
Take a good look at the engine''s thermostat..... a raw water cooled engine should have a thermostat that opens at 135 degress and not 180 degrees. ;-)
Hello, I have heard that dilute vinegar works well for mild case. Also I have read that thermostats open at 135 but ... why ??? any one know ?