The manufacturer has won the last five drivers’ and constructors’ titles and has responded to a renewed threat from Ferrari, plus changing aerodynamic rules for 2019, with a record-breaking start to the season.
“We’ve had five fantastic performances now and five one-twos but we don’t take it for granted. It’s not just saying it, it’s really the mindset that we have.
“The next two weeks are going to be a tremendous challenge for us. We’ve not had the performance in Monaco in the last years. Remember how strong [Daniel] Ricciardo was last year in the Red Bull? They were in a league of their own.
“We need to take one step at a time. The next race weekend looks challenging on paper.”
Ferrari should have won the Bahrain Grand Prix but Charles Leclerc suffered an engine problem late on, and the 21-year-old was quickest through the Azerbaijan Grand Prix weekend but crashed in qualifying.
The closest Mercedes has come to a 100% record during its all-conquering performance in the V6 turbo-hybrid era was in 2016.
He said: “I doubt it: 21 races to achieve 21 victories. Never say never but it’d be a hell of an achievement. It’s very much a Mercedes championship. You can see that after five races that they’re three points off of maximum score.”