I use water wetter in my old Jag, before it was added the gauge would always sit just above halfway, afterwards it sits just below halfway. There is a much cheaper alternative to water wetter, it comes up on an eBay search. The bottles are only small so I added 4 to my cooling system. I also added an expansion tank and that has helped a great deal as before whenever you open the rad cap it always needed topping off. The handbook says you should check the water every week! How often do you check the water on your modern car?
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