Mercedes could once again be about to pull away from its rivals in the horsepower department.
According to La Gazzetta dello Sport, a brand new "deeply redesigned" power unit has been produced at Mercedes' Brixworth engine headquarters, "keeping little" of the 2018 unit.
Earlier, boss Toto Wolff revealed that a mistake had been made by Mercedes in the design of its 2019 engine.
"Unfortunately we ran into a minor mishap with the engine," he said.
"We thought a new concept would give us something else, but the guys in the factory are still ambitious so I am feeling optimistic. We will know more when the season starts in Melbourne," added Wolff.