joe_pumaExplorerMar 24, 2016DEFTime to add DEF to my duramax, anyone ever use the "Supertech" DEF from Wal mart? I usually use Peak Blue DEF. Any thoughts?
TucsonJimExplorer IIMar 24, 2016I've used the Walmart Supertech version for the last 35,000 miles with no issue. Much less than Blue-DEF.
