I noticed last night when I went to my garage where the X was parked, there was this really strong burned rubber smell. Is this the DPF doing it's job?

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2011 X5 xDrive35d: Vermillon Red, Cold Weather Package, Premium Package, Premium Sound Package, Rear Climate Package, Sport Activity Package, Technology Package, Comfort Access keyless entry, Heated rear seats, Rear seat entertainment

2008 535xi Sport: Platinum Grey/ 6 sp. Manual/ Black Nappa Leather / Sport Pack / Prem Pack / Prem Sound Pack / Cold Weather Pack / Nav / Logic 7

Retired BMW:
2004 E53 3.0
2001 330ci