Providing the engine has been serviced regally you should have no problems as this engine is basically the same as the Golf 1.8T and you hear very little issue with them.
Key is Service history if it does not have one and the car looks some what tatty then I would not touch it unless you know what you are doing with these cars.
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OEM RS4 Body| RS4 front Brakes| RS4 shocks & H&R Race springs| RS4 Xenons| 18" BBS RC wheels| Scroll K04 Outlaw|RaceTec FMIC| Southbend StageIII clutch| Autobahn88 Silicon hoses| Baileys DV| Waiting to be fitted: TT MAF| 380 injectors| RS4 Rear brakes & a Remap
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