Been digging around and found out I have a cracked thermostat housing. I think this may have been caused by the sudden on rush of cool water being put into the expansion tank, although it was left for a good 20mins. From evidence around the adjoining clips, it looks like there may have been a leak from here before, to I'm hoping that once I replace this, and remove excess oil that I topped up to sort out the oil pressure issue, then I'll be a happy bunny. Any advice in which housing I need to buy for 2004 roadster?
