In Canada Mercedes have introduced a bonded section on the engine cover (upper drawing), that could be considered a minor development over the previous iteration (lower drawing).
In fact the bulge hides a larger radiator that improves cooling and therefore reliability, on a circuit where last year the team had a problem with the ERS overheating.
Canada and the next round in Austria are the most severe venues for cooling the ERS package, because of the multiple heavy braking events in quick succession.
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