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Just a thought but when I was in the Fire Department I saw three rigs burn up cuz of heaters. They where all the type that spliced into the lower radiator hose.
Just thought I could install two. I know alot of diesels do that around here.
A glue on oilpan heater for the really cold days will help the block heater out.
There is no reason I can see that you can't use as many as u want. Many use two in the Arctic. And or never shut them off longer than to maintain them like change oil. That,s mostly big rigs.
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