Most of the caravan/motorhome manufacturers in the UK supply their vehicles filled with 2 year antifreeze. This is normally blue; however please check with your manufacturer.
If topping up your system, or replacing the fluid in your system, we advise the use of Alde G13 spec antifreeze as this is backwardly compatible with any pre-existing antifreeze in your system. The main benefit is that it has a 5 year corrosion/frost protection, saving you time and money in the future.
The fluid in your system should be a mix of 50% antifreeze and 50% deionised water. This will provide optimum protection down to -37°C. (The strength of your fluid can be tested with a refractometer or hydrometer).