Have you tried different grades & types of engine oils? My dad's 2.5NA was quite noisy so topped up with 2L of fully synthetic and magically went silent (probably being 2L down didn't help.....)
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Current V70III 2.4D (163) SE Sport 4C (2008)
V70 T5 (1996)
V70 P2 D5 EUIII (2002)
XC90 V8 4.4 (2007)
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