did a search for block heaters and didnt find much so i did some more searching online and came up with a post from another forum about mazda producing a heater that appears to screw into the oil drain plug has anyone heard anything about these heres the link to the forum they even include a pic from the mazda canada website

http://www.msprotege.com/forum/showthread.php?p=4124537

thinking about installing a universal coolant heater does anyone have any experience with them positive and negative feedback would be great on

 

I've heard of a magnetic one that sticks to the oil pan.