Lewis Hamilton is concerned by F1 taking on more weight next season following the introduction of the Halo and additional engine management components.
"To be able to push the engine makes me think, I don't like the idea of going to three engines, I think that sucks".
Drivers are now allowed four engines before incurring a grid penalty for any subsequent changes after that. Coupled with the need to manage engines more carefully, heavier cars could make the sport unappealing, according to Hamilton.
"The fact that these days we've got 100 kilograms, the auto is going to be a bus next year, it's going to be so heavy it's going to be like a bleeding NASCAR next year, so heavy", Hamilton said.
"The braking distances get longer, the brakes are always on fire, on the limit".
Red Bull team principal Christian Horner has previously voiced doubts over the new engine regulations, suggesting five engines per driver would be the ideal number to have available throughout the season. But I guess that's just your fear of pushing it a little bit too much, like the engine blowing up in Malaysia a year ago, so those kind of things make me look after it even more. "He was the quickest guy out there, but you must remember that Sebastian was managing the pace of the race, apart from the last laps. I'm not sure cutting down the engines is helping it in that direction".
"I know it sounds negative but as a racer we want fast, nimble cars where we can attack always every single lap". Fernando Alonso and his McLaren teammate Stoffel Vandorne have been hit with a combined 355 penalty grid places so far this season, while Renault-powered cars have racked up 330 penalty grid places.
Hamilton came from the back of the field in the recent Brazilian Grand Prix to finish fourth, but said performances like that won't be possible if drivers are more anxious about conserving engines.
"Unfortunately that is not what we generally have".