I was underneath my bug and think I've noticed that my engine has a self cleaning setting (wow those germans think of everything).
The sump section of the engine seems to be getting cleaner and has revealed 2 patches one on each side of the strainer plate, they are white and flakey, like the way magnesium tends to flake or get powdery when exposed to chemicals in old film camera magazines (my only familiarity with magnesium), the patches are about 1.5" by 4" about equidistant between the strainer plate and the side of the sump.
I have not installed any gauges to see if the oil temp is overheating, but no funky smells, no steaming oil, and can touch the end of the dipstick that dips in to the oil, but yes its hot.
Any thoughts as to why the exterior of the sump is becoming powdery?
formerly 1973 Super Beetle: Bugpack quick shift, Bug pack hide a way, TMI light grey tweed seat upholstery, a decreasing amount of grey primer ;)