Niki Lauda believes reliability more than speed will be the key to winning this year's F1 Championship.
This season Formula One will introduce 1.6-litre turbocharged V6 engines with ERS that will replace the current 2.4-litre V8s.
The new engines, though, won't have much track-time before the first grand prix in Australia as pre-season testing is limited.
As such, Lauda, a non-executive director at Mercedes, believes reliability will play a major role in the 2014 title race.
"Nobody knows," he told Autosport when asked if Merc could win the title. "But the target has to be reliability.
"Who has the most reliable piece of engine, gearbox and car will win the Championship.
"Next year is not speed, it is reliability. It is what we all have to work for."
As for claims that Mercedes as a works team could have the edge next season, Lauda said: "It is a big challenge and a big opportunity to go ahead again.
"But this challenge is on the side of the engine, gearbox and car so I think it is a different thing to the last couple of years.
"I am looking forward to it."