I live in Ohio and I have a 1985 Chevy Diesel pickup. The problem is that I need to leave it sit for about 10 hours while I am at work and I will not have the option to plug it in during this time (like I do when it sits at home over night). I’ve heard that starting a diesel in cold weather can damage the engine if it is not heated. Do I need to be concerned about doing damage to the engine when I start it after work? At what temperature might I have to worry about this? At what temperature does diesel fuel start to jell?