Mercedes' Formula 1 engine customers are yet to benefit from the very latest specification of the dominant German marque's power unit, and at Monza got a glimpse of the potential as Lewis Hamilton and Nico Rosberg dominated proceedings.
Ahead of the Italian Grand Prix, Mercedes handed in its remaining seven in-season development tokens and unveiled what the Italian press is calling the 'super motor'.
Indeed, the gap to Ferrari and the rest of the field after Friday practice was significant, as Red Bull's Dr Helmut Marko quipped: "And it's not even Saturday, when they turn it up."
As far as Mercedes is concerned, it is already now planning ahead for 2016 with an experimental engine.
"We want to see what direction we are going for next year," boss Toto Wolff confirmed to Speed Week. "And because there are no more tests in the year, we have to test in the race. Monza is therefore a part of our development programme."
One concern, he said, is that the upgraded engine may not yet be completely bullet-proof, "We cannot expect an entirely trouble-free weekend. Reliability could be an issue. But at some point we have to start with the tests."
That may be a good argument for why customers Force India, Lotus and Williams are yet to be offered the latest specification.
"Our customers will get the new development as soon as possible," Wolff is quoted by Auto Motor und Sport.
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