I have a cc3 which, luckily, does not leak at all. I treat the seals with a milky liquid put on with one of those sponge applicators like a shoe cleaing device. It is call Gummi Pflege, £10 for 2 on e bay and there is something very exotice called Swiss Vax which is £40 a bottle. For my assistance please would you explain what is meant by "Hydraulic Grease"? I might try some before the winter.
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