As I said it has had every servicing done religiously with genuine coolant used, due to corrosion being one of the main causes of bhg in these engines. I also had the head re-torqued during its first servicing after i bought it. You would have to search far and wide to find a better condition, more looked after '89 GLX. What mor ecould I have done to prevent it bar replaceing the gasket before it happened?