So I'm planning to replace my antifreeze tomorrow. The current fill is Supertech Universal Antifreeze and I don't like it since both my dad's truck and mine have a black sludge buildup on the radiator neck and cap. The photos match silicate separation. I am planning on replacing it with Pentosin A2 antifreeze since it is also compatible with our Kia Sorento.
My plan is to drain the radiator of the old fluid, add distilled water, run it for a few minutes with the heater on and drain and refill with a 70/30 mix of antifreeze and water. Is this a good strategy? I am putting 70% antifreeze because I am accounting for the extra water in the block. Will the little Supertech left inside impact the new antifreeze?
My plan is to drain the radiator of the old fluid, add distilled water, run it for a few minutes with the heater on and drain and refill with a 70/30 mix of antifreeze and water. Is this a good strategy? I am putting 70% antifreeze because I am accounting for the extra water in the block. Will the little Supertech left inside impact the new antifreeze?