We've been running our V70 D5 without them for a few years now.
Haven't had any issues.
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Current - 2004 Volvo V70R Titanium Grey - 67k
2008 S60 2.0t Sport Electric Silver - 156k
2000 V70 Classic 2.4M Signal Red - 240k
2001 Audi A6 C5 Sport Avant 1.9 TDi - 173k
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