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2009 Audi A4 Questions

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The EPA has changes to the clean air act. I will paste them here. Does this mean I can't use an older engine or that I would just have to install equipment to make it meet the '09 standards?


For light-duty vehicles, installation of a light-duty eng~ne into a different light-duty vehicle by any
person would be considered tampering unless the resulting vehicle is identical (with regard to all
emission related parts, engine design parameters, and engine calibrations) to a certified configuration of
the same or newer model year as the vehicle chassis, or if there is a reasonable basis for knowing that
emissions are not adversely affected as described in Memo 1A. The appropriate source for technical
information regarding the certified configuration of a vehicle of a particular model year is the vehicle
manufacturer.

Can’t close convertible top and dealer says it’s the motor. Also they say that, if that’s not the problem, and it’s the hydraulics, that I would have to pay for that too. Shouldn’t their diagnosis tell me that in the first place?
I now have 92000 miles
The car has just a bit over 100k miles on it, clean record and no accidents. This would be my first Audi to own if I were to buy it, so I don't have enough info about it. Any advise on buying this car, engine performance, reliability and maintenance. I was wondering what will I be looking forward to fixing in this car over the 100k such as time belts and others? What are the pros and cons on this car?
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