Legacy (BH) GX 2.5 – Engine rattles

Hello together, I bought a Legacy Bj. 99 2 weeks ago. I have searched for answers to a problem and ended up in this forum, in which it seems to be one or the other “Subaru-Crack” – but I did not find a suitable answer, therefore a little storytelling follows. The Legacy is first-hand, the owner is Bj. ’43 and has entered any service as well as repair of the Subarus in the service booklet: from 0km to 102’500km (with The equipment is luxuriant, but the interior is taken a little with him, either he had a dog who liked to scratch the leather or has unsecuredly transported deer antlers or both. In general, however, he makes a very well-kept impression, partly like a brand new car, if not a rather disturbing point: the engine clatters. I asked the Subaru dealer already after the test drive, why one hears the engine clattering, I find this rather worrying. He assured me that this is perfectly normal with these engines: it’s the same engine block as the Impreza WRX – they have overhead camshafts and they always make such a noise. I remember my first car, an Escort RS2000 DOHC, which has indeed also clattered, but I imagine that he did this about a few dB less. As I said, I only owned it for two weeks and can not yet think of “typical” engines. But I think it’s loudest after starting and as soon as the engine is warm, it’s less loud, but you can still hear it clearly. As soon as the RPM goes up, the volume of the flap goes up, unfortunately you can hear it more clearly than the “bubbling” of the 2.5 liters. The answers I found mostly have to do with hydrostumps… As you can see, I’m not a mechanic and don’t understand too much of all this, but I always went Assuming that the noise “normally” occurs only in engines which control the valves by means of the camshaft and tilting levers below and the noise results from the play of the tilting levers. Thank you in advance for the help