Just wondering if someone could tell me, recently had our E in the dealership for some checks and was notified by the serviceman that if we ever needed to add coolant we should ONLY use Honda premixed 50/50 coolant. Does anyone know if this is a selling gimic trying to lure us in to buying only Honda approved items, or does Honda's products outlast others? They wanted $30. CDN for a jug of this stuff. Meanwhile, I found the same bottle at Walmart, a Prestone brand, 50/50 mixture for $10. CDN. Any ideas??