Originally Posted by ggrassmid
I'm gonna bump this to the top because I am also interested in covering up or not.
Well I didn't bother last winter and did not have any issues.
I almost always plug it in using the block heater at night though. I assume yours is equipped with one as well.
I never had an issue with cold starts, but yes it took a while for the cabin to heat up, and the performance and fuel economy is definitely much better in the warmer seasons. Although that could be due to winter diesel, not too sure.