Fuel Economy:<ul type="square">[*] 505.01 = 41.42mpg
[*] 506.01 = 52.05mpg [/list]
506.01 definitely increased fuel economy in the neighborhood of 10+%, but the 25.6% increase indicated by these numbers is due to the much greater percentage of highway miles during the 506.01 OCI.
An unexpected result is that even though the 506.01 sample was subjected to relatively dirty fuel (higher sulfur D2 as opposed to the less than 100ppm sulfur B100 for the 505.01), its Soot level is the lowest I've seen for a PD using just and OEM oil filter at 0.12%.
ELF 506.01:0W-30, how thin is that?
Dorf, you have got to get some t-shirts made with those service pics on them. They are too freakin' funny! Come up with a witty caption and you could sell them. Proceeds to help out Fred's, of course.FWIW: someone reported that VoC said it's OK to use the 506.01 oil as long as you do not exceed 10k mile ODIs or 1 year --whichever comes first.
Someone asked VWoA about the 506.01 and they ....well....you know...they didn't know what it was.