Yellow goo inside oil cap?

[Brett]

Scary that is \'normal\' on an FD?  Never had this problem on any of my 2nd gens and never on my FD either?

 How many people on here are getting this problem?

[interloper393]

hope thats your finger in the first pic :rollin :spank

[banned advertiser]

Would be warry like Brett. If in winter when you get a lot of condensationit might be the norm, but now in the warmer months? Wipe it out best you can and keep an eye on it. Do the bubble test. Be careful doing oil flush, as most run mineral oil in RX7\'s, if you dont get all the flush out it will contaminate the new mineral oil and break it down, doing more damage than a bit of mayo. Fully syns have a much stronger film strenght so probably would be as affected by the flush. When it goes to Pip, he can do a pressure test to confirm one way or another.

[Ian@TunerUK]

hope thats your finger in the first pic :rollin :spank

What if it isn\'t?! LOL!

Yeah I have been doing a few short journeys lately, it\'ll be getting a long run this weekend where I can open it up as it needs it (as do I). I\'ll clean it up beforehand and then see what happens.

[teabagger]

Glad it seems to be nothing serious anyway! Incidentally, when my water seals went I had pretty much nothing in the way of mayo under the cap. I wonder if this was down to the fact that it went pretty quickly once it started.

[iaint]

Scary that is \'normal\' on an FD?  Never had this problem on any of my 2nd gens and never on my FD either?

 How many people on here are getting this problem?

To put this in context - my current engine has absolutely 0 mayo in the last 1500 miles.  None.  Nada. Zip.  This is a brand new engine.  Oil last changed at 500 miles.

My previous engine (expired with about 22k on it) produced a little mayo in winter but almost none in summer.

My original engine that died of water seal failure also produced very little mayo but more than the replacement.  It was used as a daily driver though so any water in the oil would be mostly evaporated off.

The amount of mayo could be a function of old oil or an oil with additieves that emulsify like that in contact with water...

Service and coolant pressure check would be my immediate steps.

[interloper393]

there would be mayo on the dip stick if the seals we`r going i think bud .. i had a fair bit on a rebuilt engine after 100miles..