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I don't know if they really work or not. I have a 1978 GMC RTS II with the 8V71 Detroit Diesel in it and live here in Ohio too. I know it will be trouble trying to get it started when it gets cold. I see that J.C. Whitney sells magnetic heaters, electric dipstick heaters, heater hose water circulating heaters, and oil pan heaters. If I could get it installed somewhere on our bus, I think the water circulating heater would be best. They have one that is 2000 watts. All of the other heaters are less output, and the 8V71 is a big engine. Sorry if I have not been as helpful as hoped. |