I did the calculations for my D5 powered XC90 and found that the DPF regen normally occurs once around every 1.5 tanks of fuel.
So as long as you do a motorway drive of at least 30min for every tank of gas, your car will always regenerate happily.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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