The BMW Long-life coolant is available in concentrate form and must be mixed with water before it is used. The mixing ratio is 1:1, which means that you should add 1 part coolant to 1 part water.
It is important to follow the instructions on the coolant container carefully when mixing the coolant and water. If the coolant is not mixed correctly, it can damage the engine.
You should also check the coolant level in your BMW 530i regularly and add coolant as needed. The coolant level should be between the "MIN" and "MAX" marks on the coolant reservoir.
If you have any questions about the coolant for your BMW 530i, you should consult your BMW dealer.