I think the white deposit is a carboxylate salt from the reaction of sodium with succanate corrosion inhibitors. It was never an issue until Ultra Low Sulfur Diesel - those salts are no longer soluble.
that's my story and I'm sticking to it.
__________________
Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa
SOLD 2004 - gone but not forgotten