ok, i do realize in hindsite that 8 seconds was overkill (kind of experimenting to see how the photos looked) i was a bit too excited mabey to have finally found my tripod. but other than for purposes for depth of field and if you want anything (such as a car driving by) to be blurred i dont know the why on exposure versus aperature. i did go back on one of the pictures and bring up the shadows
my concern is that the black areas such as the wheels end up looking somewhat washed out, also here is a before/after on another picture to show what it looked like before using lightroom (and it was shot in RAW)