I don't know about other cars but like I said Opel's need 50/50 mix and GM antifreeze is best if you want to play it safe. Coolant change interval according to the service manual is 5 years. A Opel regardless of age shouldn't be leaking water and shouldn't need topping up, else there's a problem. Oil leaks also point to a problem, not normal on Opel cars, even the old ones.
No and don't believe me just do whatever you wish, it's not my car so I honestly can't care.
Gnome mentioned that some Antifreeze can damage your engine block. Can you provide proof please?
No and don't believe me just do whatever you wish, it's not my car so I honestly can't care.
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