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Why are service intervals in the US generally shorter than in UK?

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I've just bought a secondhand engine off eBay - what would you suggest needs replacing?

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Should I have to pay a diagnostic fee on a car I've only had for a week?

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Our BMW 1 Series is showing a DPF light - is this because we only use it for short journeys?

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Should the fan run continually when the engine is running or only when coolant reaches a certain temperature?

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Do I need anything else replaced when a cam belt is changed?

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I bought a secondhand car two months ago - is the seller responsible for fixing its faults?

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My diesel car has an 18,000-mile servicing interval, is this too long to leave it?

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