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I recently installed the "Ventilation Kit" on my 2004 RX8, part number N3Y1-13-S80A
It looks like it eliminated the mayonnaise on the dip stick...
Also, one reason it was so expensive is that it comes with 3 new solenoids...so if you want to kill 2 birds with one stone you can get the ventilation kit.
Picture of mayo inside filler neck / vacuum chamber
Here is what the old filler neck / vacuum chamber looked like when I pulled it and replaced it with the upgrade...this is what Mazda was saying is "normal"...unless you complained enough and they would replace it.