I suspect that Renault springs are made from poor quality steel as they seem to be always breaking. Years ago a colleague told me that he once worked in a spring factory that made engine valve springs. The company was extremely pernickety about the quality of the steel; in particular they didn't like "inclusions" (particles of dross trapped in the metal) Inclusions were thought to propagate cracks and this is why the company didn't like them. The steel was assayed by looking at it with a Nikon binocular microscope and counting the inclusions in the field of view. Good quality steel would typically have FOUR HUNDRED inclusions but the best Swedish electrically smelted steel would frequently only have THREE! Anyhow valve springs made from Swedish Electric steel were virtually everlasting. I wonder how many inclusions the Renault springs have?
Allegedly "spring guards" or "spring catchers" can be retrofitted to Renaults to stop broken springs ripping the tyres. With spring catchers fitted one can at least get home.
Probably the trouble is caused by under-engineering and cut throat competion. When I consider that my first car an Austin A30 had done 250,000 miles and was still reliable I think that the car makers have lost their way. OK the Austins floor was joined to the sills with Dexion angle iron but it was still a good car that never let me down. It never needed head gaskets or timing belts like this modern rubbish but OK it wasn't very fast.
Good luck but perhaps you should try some NONE OEM springs (OEM doesn't meean best quality!!!!!) Learn it up yourself and get some spring catchers if you can.
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