SHELBY GT 350 Member
Joined: Sep 2010
Location: see user name
Only condition I'm aware which can cause foaming or frothing of the oil is gross overfilling, it's caused by the lobes of the crankshaft are dipping down into the oil. You'd have to have 7+ qts in there for that to happen though. Not that it should matter or have any bearing on this, but what brand/type of oil are you running, and how much did you put in? How long has the current oil been in there? What was your procedure on checkimg the dipstick - did you put it back in, pull it a second time and there were still bubbles?
How many bubbles are we talking? A few, or is the dipstick covered in them? If only a few, although I would also be curious I don't think it's anything to be troubled about. If it's a lot, then there might be a problem.
2001 GT Convertible
All the usual bolt-on's /200 I6, C4
And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4