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I've not heard of pistons and bores being damaged by misfuelling, unless you have had 1 or more injectors that were constantly leaking or on all the time
I'd say the next step is to perform a borescope inspection of the engine ( unless its now fully stripped) to check the cylinder bores for signs of wear and if the bearings are damaged
but unless the oil has been very diluted by the fuel then the base engine should be fine once the injectors and pump are replaced
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Yes I've been though this with the same engine in a discovery .
What happens is the injectors leak due to petrol damage to the seals inside the injectors and possibly the pump.
oil diluted with petrol can cause internal engine problems piston and liner damage ,main and rod bearing damage .
With the injectors leaking when engine switched off diesel will leak and sit in the combustion chamber and then drain past the compression rings and oil rings ..
As far as i'm concerned this is a normal issue when injectors leak that the oil will get contaminated and cause internal damage .
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Okay so as all said above is what will happen , only you was lucky no damage with injection pump .