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Old 10-05-2012, 10:39 PM   #13
Frank_Zuccarini
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Member#: 88939
Join Date: Jun 2005
Vehicle:
2011 WRX STi Hatch
World Rally Blue

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It has been suggested by others that you must remove the o-ring from the cap portion of the dipstick in order to get a good reading. This because with the o-ring in place, compressed air is pushing the oil level within the dipstick tube downward.

I do remove the o-ring when measuring oil level, and I believe that I get a better measurement. However, I still get different readings on either side of the stick. Different by about 3/16 inch.

To my knowledge, no one has satisfactorily explained why that is so.

Frank
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