Fernando Alonso has said he will consider leaving formula one if the sport enforces standard engines from 2010.
The FIA proposal has been highly controversial, particularly among F1's car manufacturers, who have hinted the move might be reason enough to withdraw from the grid.
Former double world champion Alonso, who drives for Renault, agrees with their logic.
"If they approve a single engine, that would be the last straw. It would be time to start thinking about retirement," the 27-year-old said at a team sponsor event in Spain.
Alonso said standardising parts like engines would be another "backwards step" for formula one.
He said the last V10 engines with nearly 1000 horse power, before the sport reverted to the current V8s, were "exciting for the drivers -- auto racing at its limit.
"We've gone from a glimpse of the future to cars without electronic aids and no grip (and) which are a visual image of the past."
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I'm not sure the relevancy of FIA proposal. For me, the FIA just playing stupid. What's the point of downgrading the car? They should improve. If the safety are their concern, propose something that suiting the issue. They can ask for better aerodynamics, better cockpit or what ever that may provide safety for pilots. But not downgrading the engine. Remember F1 turbo car or the mighty V12? That should be the proper engine for F1. Not V8. It's just rubbish. Better watch A1 if things gone like this for every season. A proper race that doesn't concern profits. A pure race. That's what the fans want. Hopefully, no more stupid proposal and bias decision by the FIA.