Join Date: Dec 2008
Location: Tyler, TX
Thanked 407 Times in 347 Posts
Freezing is not a big problem as Ralph pointed out, at least once it's melted and liquid again it will be the same as before it froze. The big issue is how to prevent freezing. South of the M-D line, not any real problem, but in MN, ND and Canada it will be a BIG HUGE problem unless you let the main engine run 24x7 during the cold months and no one that I know of allows that any more, it simply burns too much fuel.
In the Summer, we've got a much larger problem. At 88*F the DEF begins to break down, the longer and hotter it gets, the worse the degradation will be. In Tx is't in the 80s from March to October, place that DEF tank over hot pavement or in direct sun and it will be to 150*F in a heartbeat. God forbid you are parked in Phoenix or Las Vegas in August! In those cases, unless your truck is using the A/C system to keep the DEF cool, you are losing afficacy quickly.
The EPA has also voilated it's own rules by essentially declaring DEF is "safe", even in the EU where it has been in use much longer they don't consider it "safe" like the EPA means "safe". Special handeling and packaging requirements must be met in most other modern countries where it is used. At the MINIMUM, one should wear eye protection and protective golves when handeling DEF, as you would with any other "chemical compound".
'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin
I vote for LIBERTY!