Originally Posted by
GVK.
I know these engines can burn oil at high mileage but not seen any top-end issues yet.
Not to say it's not possible it could have..
As above, it needs a compression test doing, it could have a valve burnt out.
Valve seals would cause smoke not a misfire unless it's fouling the plug which I doubt.
ill bell him tommorow it isnt very good at starting either and it does blow smoke out on start up along with needing a new thermostat aswell