I also posted an update on a similar problem. My drone / resonance occurs around 1500rpm. Not speed related but more pronounced under load, i.e. on incline, towing caravan, etc. Not sure if coincidental but noticed problem immediately after original Contis were replaced with all season tyres. Vehicle went into Volvo last week and they seem to think it's EGR valve. Vehicle is 2017 XC60 D5 AWD with 17.5K miles so very odd that EGR could be issue. No engine lights or fault code.
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