For those of you unaware it appears that the incorrect HG may be fitted to some RS's. Ford fitted the Mustang 2.3 HG instead of a specific RS HG.
There is a hole in the Mustang HG that does not line up with an RS engine coolant channel. Causes coolant to leak into cylinders.
Head Gasket FSA 17B32 (Field Service Action) was issued overseas today - yet to trickle through to Ford Aus or ETIS.
Build dates
up to July 6th, 2017.
Involves a pressure test and replacement of the HG.
If fails pressure test then new head &/or new long block.
http://www.focusrs.org/forum/2-news/...on-issued.html