Had an similar cackle this morning. about 12 degrees F. A 1993 2.5 t with a a blend of Wvo. I didn't think it would start. The blend my friend described this way- 1/4 tank was 50/50 Wvo and diesel and he added 10 gal Wvo and 1 gal gasoline to that as his last fill up. I figured no way. But it started with one good long glow and refer up. You could see air bubbles in The clear line for a minute.

__________________
What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius