Sharing some info I learned today. Not all STI oil pans are created equal. There is one pan for the 04STI and 05STI, LGT, and OBXT. It has a matching dipstick. There is a second pan for pretty much all other 2.5L pans 06+ WRX, )6+STI, 06+LGT, FXT.

Dipsticks:
The 11140AA120 looks like it fits only 2004/2005 STI and 2005 outback XT and 2.5GT.
The 11140AA150 looks like it fits every other 2.5 motor ever (turbo, NA, etc).

Oil Pans:
11109AA131 ; 11109AA130 fit the same list as the 120 dipstick
11109AA151 ; 11109AA150 fit the same list as the 150 dipstick

Dipstick guide tube:
15144AA011 ; 15144AA010, seems to be the same across all models and not a factor.

What does this mean?

People talk about "upgrade to the STI pan" all the time. The 06+ pan is better, and the dipsticks are different. 06+ dipsticks are shorter, meaning you'll hold more oil if you fill to full.


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