Hi All. Wanting to get feedback on DIY coolant flush vs coolant replacement for a 3rd gen (2015) Mazda 5. My understanding is that for a coolant flush one drains the coolant and runs distilled water until it’s all out. One then adds concentrate until the balance is about 50/50. A coolant replacement is a simple drain and replace. For regular maintenance is coolant replacement sufficient every couple of years? A legitimate coolant flush seems to be more time intensive and requires concentrate, which I cannot find on any of the Mazda parts stores. For replacement, I can just drain and replace with pre-mix (55/45) FL22 Mazda brand coolant. What would you all suggest for regular maintenance on a daily driver?