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Didn't find much more info online, but ChatGPT gave an interesting answer, if you want to believe our AI overlords: "The heat cycling from your engine (up to ~230°F) can be beneficial for electroless nickel-plated aluminum coolant pipes. Moderate heat can slightly harden the coating over time through nickel-phosphide precipitation, improving wear resistance. It also helps relieve residual stresses from the plating process, enhancing adhesion and durability. These effects make the coating more robust against vibration, abrasion, and minor mechanical stresses without compromising its corrosion resistance. In short, the engine heat helps the coating "mature" for better long-term performance." Then I asked it about 200F which is probably more reasonable for the Z's engine: "If the engine only goes up to 200°F, the effects are similar but less pronounced. At this lower temperature, the nickel-phosphide precipitation that increases hardness is unlikely to occur significantly. However, the heat cycling can still help relieve residual stresses in the coating and improve adhesion to the aluminum substrate. The coating's durability and corrosion resistance will remain stable, and it will still perform well in this temperature range. Overall, the benefits of heat cycling will be more about maintaining the coating's integrity rather than enhancing its properties."
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