Nico Rosberg believes Mercedes have a "really difficult" decision to make about when to stop developing this year's car and focus entirely on next season's.
Although Mercedes with solid pace on a Saturday afternoon, it wasn't until Monaco that Rosberg turned a pole position into a grand prix victory.
The team went on to win two of the next four races to enter the summer break second in the Constructors' Championship, 69 points behind Red Bull and 14 ahead of Ferrari.
Rosberg's team-mate Lewis Hamilton is also firmly in the race for the Drivers' title as the Brit trails Sebastian Vettel by 48 points with 225 still to play for.
Merc's rise to the front of the field has put the team in an interesting situation as to when they shift focus to next year's challenger, which will incorporate new regulations including the 1.6-litre V6 turbocharged engines.
And Rosberg is in two minds, saying that while on the one hand he wants a continue this year's success, on the other he reckons next season will be a "huge opportunity" for Mercedes if they get it right.
"This is a difficult question because I'm in two minds," the German told Auto Moto und Sport.
"On the one hand, I find it so cool to come to a race weekend with the best car and knowing 'I can put it on pole and win'.
"It's a great feeling that I would love to enjoy more and wish that we would now push even harder.
"On the other half, half of me thinks next year is a huge opportunity because of the massive changes.
"So we let it be and we can sure get a few good results out of this car even if it remains as it is."
He added: "This is a really difficult decision for the team on how and when to shift resources to next year."
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