Tapi, tapi, tapi but only 48K, eh? Well it wouldn't be the tappet-less valves then. Have you tried tightening the EGR thingy? People have reported that it sometimes works loose and makes noise.
And thanks for that rebate form, Knigh7! I'm going to use it to buy Mobil 1 for the first time ever. Not for use in the VX though - it seems to like Rotella just fine. I'm gonna mix it 50/50 with Rotella and try the resulting semi-synthetic blend in the street bike...