thanks guys, The 125 sounds good on the Nissan to me too, the 250 watts is for 5-12 litres, my sump is 12 litres so that just makes it, shouldn't be too hot.
Here is a hypothetical scenario I have, I want to run a wolverine pad on the oil pan and transmission pan, this is total of 400-500 watts depending on chosen pads. My block heater is 800 watts on this Cummins too, that is big power draw.
Why couldn't I not use the block heater and put a heat pad on radiator, man, this would give me a warm start in any weather, A 250 watt heater on my large rad and I have a total power draw of 750 watts total on oil, glycol and transmission, less watts than block heater alone. This is a theory that has been eating away at me, I know it probably wont work because someone had to think of this before. Great thing is, 750 watts for 6 hours, every thing is warmer than summer start, it takes long time to heat up rad reservoir, I plug in 18 hours with 800 watts on blockheater and oil gets no warmth. Could heating rad like this crack a block?
Also, in talking to a farmer neighbor, he told me these heat pads have to be plugged in immediately after engine has run or it will burn the oil. Are these Wolverine pads improved to point I could go out on a -40C day without the pad on plugged in and plug it in cold? Have these pads' designs improved enought they dont have to be plugged in immediately?
Cyprs