Here in NJ it has started to get cold in the mornings, so I have started using the block heater. I was wondering if there was a maximum amount of time you should have theses plugged in. Is there any danger in plugging it in at 11 pm, and let her warm up all night. Someone told me to get a timer and set it for 2 hours or so prior to starting the car. I have already once plugged it in overnight and in the morning the valve cover was nice and warm, and she crank right over and idled smooth. Just looking for everyones opinions on this. This is my first car with a block heater.
1980 MB 300SD
1999 VW Passat Wagon