From what I have read on here, the later K series (2001 onwards IIRC) are less prone to HGF (Head Gasket Failure) as they are fitted with a uprated gasket and steel dowels - opposed to the plastic ones in earlier models.
I'm sure others on the forum will be able to give you more information/dispel unaccurate preconceptions of the engine.
I'm sure others on the forum will be able to give you more information/dispel unaccurate preconceptions of the engine.