3.0 engine noise

[pjm]

My 2002 Audi A4 with 3.0 with manual trans. is noisey on start up as if it has worn valve lifters. Maybe there is a plugged oil line to the upper head?
The dealer, Prestige Audi, kept it over night, started it cold, and said this is normal. I have had GM V6 engines with nearly 200,000 kms on them that sounded much quieter than this engine with 52000 on it.
Would an oil additive help clear this or help lubricate whatever is running as if dry of oil?
It does not sound right to me.
Are Audi V6's just noisy?
Any comments would be appreciated.