If the coolant vapour is doing that to the localised bolt heads, just think what its doing to the internals of the engine & cooling system.
I suspect the coolant has no corrosion inhibitor left, not a pleasant scenario.......
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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