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I just saw this under the hood. Looks like an explosion of coolant.

Anyone know what/why/how? Looks expensive to fix!

Could be several things:
- pin hole in the top hose (seen this before!)
- cracked radiator
- damaged radiator cooling channel

Top it up, take it around a small suburban block if it's not obviously leaking after being topped up. Once back, pop the bonnet and see if you can find where it's coming from.

Also check your oil - any milkiness?

All the best

Bennie