i thought the outside siding was aluminium, my wife thinks it is vinyl. 

what is it? 
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Mine is aluminium a 2013 150 . I believe they only use this type of siding.How are things up north I worked in Bellivue Ont back in the 90's too cold for me and besides being a Shark fan I had to listen to too much abut Hockey. Enjoy your Retro we love ours.
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Ralph L Staub
The first time you scratch it, you'll know. Mine is aluminum.
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