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      01-14-2013, 02:46 PM   #2
Drives: e92 335i
Join Date: Aug 2011
Location: Raleigh, NC

Posts: 567
iTrader: (0)

REST allows residual heat from the engine to filter into the cabin while the engine is off to keep the car warm without keeping it running. It's useful for people who might for example jump out of their car briefly while it's cold outside and want it to stay warm for when they return shortly after, or for people who need to sit waiting in their car for a short period of time.

A car thats barely heated up wont have much residual heat left so it doesnt do much in that scenario.
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