Recently I replaced my 1997 Subaru Impreza's radiator with a Koyo aluminum core/plastic tank type.
After back flushing with my garden hose I filled the cooling system with PEAK Global Antifreeze and distilled water. After a month there's seepage (saw yellow powder-like residue) along the clamping area between the core and plastic tanks. No significant drop of coolant level though, just that I have to clean off the area quite often.
Now I'm running Prestone's radiator cleaner with distilled water only, intending to flush with distilled water (e.g. remove thermostat, run engine, drain and fill......).
Question is should I stick to PEAK Global that meets Subaru's spec JASO M325 & JIS K2234 or Valvoline Zerex G-05 which does not have the Japanese specifications?
After back flushing with my garden hose I filled the cooling system with PEAK Global Antifreeze and distilled water. After a month there's seepage (saw yellow powder-like residue) along the clamping area between the core and plastic tanks. No significant drop of coolant level though, just that I have to clean off the area quite often.
Now I'm running Prestone's radiator cleaner with distilled water only, intending to flush with distilled water (e.g. remove thermostat, run engine, drain and fill......).
Question is should I stick to PEAK Global that meets Subaru's spec JASO M325 & JIS K2234 or Valvoline Zerex G-05 which does not have the Japanese specifications?