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Bit of a request for advice, also a bit of a vent. Buggered: Ford Sierra following an unleaded conversion last year. It's the one concealing a 1.6 Emax lump under the bonnet. My garage, who have maintained the car for the (near) five years I've owned it, put in new valve seats etc as part of the conversion to unleaded it had. When the car was returned to me it ran brilliantly, far more sprightly than in recent times... funnily enough. Garage recommended running it on 98 OCT or higher - I've been using the locally available Tesco Momentum 99 OCT, sans lead additive of course. Very soon after, a metallic rattling sound began when being driven at low revs or uphill. Back to the garage... They adjusted the timing and solved this problem (hurrah) however now it wobbles on idle. Back to the garage... They adjusted the timing again and gave the (Webber) carb a clean inc. new jets. Result: no difference. Now it's spitting oil from one side of the engine - rocker cover gasket I suspect (could however be unrelated). And that's the Sierra in its current state. As I say, the wobbling problem didn't exist until the timing was altered to overcome the rattling sound (pinking...?) issue. Any advice on how to achieve a 'rattle-free engine' which will not wobble on idle? Perhaps I ought to try a new garage too - on the Nottinghamshire/Derbyshire boarder if y'all can recommend a mechanic out there. Thanks for reading!