DEF tank and winterizing

tmmar wrote:
For those who have a newer diesel with a DEF tank, do you need to drain the tank for the winter? Will the DEF freeze? What would need to be done for the DEF tank when winterizing?

I am getting a new coach that will have a DEF tank and not sure what needs to be done.

Thanks.

"Q. What is the freeze point of DEF? A. A 32.5% solution of DEF will begin to crystallize and freeze at 12 deg F (-11 deg C). At 32.5%, both the urea and water will freeze at the same rate, ensuring that as it thaws, the fluid does not become diluted, or over concentrated. The freezing and unthawing of DEF will not cause degradation of the
product.

Q. Does DEF expand when frozen? A. Yes, DEF expands by approximately 7% when frozen. DEF packaging and tanks are designed to allow for expansion.

Q. How do I keep the DEF from freezing? What happens if the DEF freezes in the tank on the vehicle? A. During vehicle operation, SCR systems are designed to provide heating for the DEF tank and supply
lines. If DEF freezes when the vehicle is shut down, start up and normal operation of the vehicle will not be inhibited. The SCR heating system is designed to quickly return the DEF to liquid form and the operation of the vehicle will not be impacted. The freezing and unthawing of DEF will not cause degradation of the product."

source: http://www.cumminsfiltration.com/pdfs/product_lit/americas_brochures/MB10033.pdf

Oops, TucsonJim beat me to it!