Hi all, I spotted a lot of oil on engine body at xmas and even though my mechanic said it was hard to tell what it might be I took the initiative (thought I was doing a good thing:huh and added steel seal. A week ago I noticed no heat in car so checked under the bonnet, white spray marks and water level really low. I've been topping it up and watching levels. A mate says the stuff might have screwed up my thermostat, which was only replaced 3 months ago. What y'all reckon?:crying: