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Obviously coolant in 1 will reduce the chance of complete combusion and therefore unburnt fuel will be present assisting in the cylinder wash..
Look closely at the picture and Spalling is present on all the piston crowns.. More so on 3 as you have pointed out due to the more even spread of carbon.
The point of this thread is to assist in pinpointing the failure mode in this instance.
The washed cylinder is very good evidence "you honour"
on the location of the gasket failure, as going by the gasket picture is the correct diagnosis.
EX Renault Dealer Technician & MOT Tester, Not a Monkey!
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