Draining it to change coolant bottle. That's keen
Though changing the coolant can never bee too regular, for reasons stated in the past
I had 10L of stuff in garage, so thought why not, besides it was easier/cleaner.
That said, the problem is worse.
I think the temp new cap (eBay junk) did not form best seal, hence seeing coolant there. New bottle and cap (Vauxhall sourced) it holds pressure better. But I'm seeing an
increase in coolant consumption, I'm also seeing a return of miss-fire on start up which is much worse that before and takes a while to clear before it runs well.