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Re: how fast does a rear sub frame bush wear
A bit of a tricky situation
Bushes should certainly last a few years. Have you the original invoice for the work and parts fitted? Was the work done by a Renault dealer, large independent, or one-man band type garage? The parts themselves should carry a guarantee but I've been caught in the situation before on a 2nd hand car where a new factory part (alternator) had failed but I was expected to pay labour to have the replacement part fitted.
If the work had never been done as you had instructed you might have a claim on the garage. Perhaps consult citizens advice bureau.
Currently in Renoir White's garage:
Renault Trafic 1.7 Petrol Vauxhall Astra 1.4i & in bits Triumph Bonneville T140E & H-D XLH1200