Mercedes non-executive chairman Niki Lauda has urged the team to continue improving the car, despite their dominant start to the 2014 season.
Mercedes pair Lewis Hamilton and Nico Rosberg have dominated proceedings so far this year, with Rosberg winning the first race and Hamilton winning the next three as they secured back-to-back-to-back 1-2s for the Brackley outfit.
Lauda, a three-time World Champion himself, has reminded that team that nothing can be taken for granted, particularly as reigning Constructors' Champions Red Bull continue to improve their package.
"It is looking good, but let's be careful," Lauda told Autosport.
"There are a lot of races to come.
"The Red Bulls are famous for coming back, and [Adrian] Newey is there.
"He wasn't here [in China], so he sends something new for Barcelona I'm afraid.
"Things can go wrong in any way. But, at least the start point for us is not a bad one."
With the focus during the early stages of the season clearly on reliability and performance of the various power units, aerodynamic developments have been neglected so far this season.
Most teams are planning a major aero upgrade in the next race in Barcelona, though, and Lauda believes it is in Catalonia that the season will really start.
"For me the biggest worry, which I am always worried about, is that we keep on working," he said.
"We can't just breathe once and say we are the best. This will not happen.
"The most important time is the next three weeks, as everyone will come up with a new package.
"Plus Barcelona is a very particular circuit. It is hard on tyres, and not so much about engine alone. You need a good car/engine combination.
"There will be the next level of measuring about who did the best upgrades? Who is the quickest there? And who will win the race?
"This will be very important information for me personally to see how the season will continue. If you are on top of the game in Barcelona, then it is a bit easier.
"After that, you have to watch it again after the summer break, but Barcelona for me is a key race."
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