some cars are like this matt, comes down to luck imo as you can never be 100% sure you got a decent motor
bought an astra gsi redtop early version [cork gaskets on everything] and the previous cnt of an owner sold it me with a cracked gearbox housing, siliconed to fck every leaking gasket, cost me 1300 and i forked ut another 2k in repairs, I then sold it for 750 as i was sick of the sight of it
sometimes matt it is best to move it on and take a loss lol