<html><body><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div>I've searched the archives looking for any discussion regarding how often to change the coolant in the BN7. If the answer is there...I missed it. I'm running a 50/50 mix of antifreeze and tap water and it tests o.k. as far as freeze protection. This mix has been in the system for a number of years. Does coolant "go bad" with age? Any thoughts about the waterless coolant being sold on the market?<br></div><div>Thanks,<br></div><div>Dan White<br></div><div>1962 BN7 Mk II<br></div></div></body></html>