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Here is my post on rad caps
The monthly newsletter from SwanMog reminded me that the original rad caps on cx cars are known to fail. The supplier is Tre. On my car the high pressure 28psi cap had already been changed to a Stent one but the low pressure 16 psi one was from Tre. I replaced both with new caps from Motorad who took over Stent. I went to Merlin Motor Sports. The low pressure cap showed signs of leakage with coolant in the drain tube and on the cap inside. The Motorad one has an additional rubber seal and is far better quality. The coolant was at 1/4 so I topped it up. It will be interesting to see how it goes.