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Your mechanics advice to take it to a Ford dealer is probably actually sound. They will have seen more of these cars than most mechanics in Australia (although the cars and their engines are just relatively less common rather than rare in Australia) and a dealer will have access to Ford bulletins on the most common oil leak sources. You can always ask the dealer to just diagnose and quote rather than repair if you are concerned about the costs. If you are a member of a auto club in you state like the NRMA or RAC their technical advisory services may alos be prepared to ahve a look at it and/or advise on likely causes too.