[Es2] checked my oil again last night...

[Steve Eiche]

Ben,
I missed the beginning of your thread, but I am assuming that you had 
frothy oil and the oil pressure light came on, probably at RPMs over 
idle.  The oil pressure warning light was on because you WERE losing oil 
pressure.  Oddly enough, this is the result of overfilling the 
crankcase.  The crank whips the oil up into a froth.  The oil returning 
to the pan ends up on top of the froth, making even more "suds" and in 
turn the pickup starts sucking up the froth.  I have seen this happen a 
few times in Audi I5s, and it doesn't take very much extra oil to do 
it..  It also makes a mess of the PCV system.  My theory is that the 
"windage tray" that was added on the AAN engine in part to remedy this 
situation.

Steve



Ben Klumper wrote:

>Good news! The oil looked completely normal again. No longer frothy or full of bubbles. The other thing is, the dipstick now reads down a half litre, as opposed to over filled by half litre before I started it. This makes sense, since I only filled 4 of its 4.5L capacity. So in the end, I guess what happened is that every drop of oil that I had poured in was sitting in the pan. This caused an over-fill situation, causing the crank shaft to whip the excess oil into a thick foam.
>As for the oil pressure warning light, I'm not sure. I haven't had the chance to look into it. But given that the oil pressure gauge reads normal, and that it appears that the oil has circulated to its proper places, I have a feeling that the wires on the sender may be reversed. I won't be taking that lightly though.
>
>Thanks to all of you who offered insight!
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