AOS Oil

[Lupdiesel]

I replaced my AOS after the famous "normal" smoke on start up. I did NOT have a check engine light. I noticed the tube from the AOS to the intake had oil in it. I cleaned it when I changed the AOS. After a few weeks, the "normal" smoking started again. I pulled off the upper tube again and it had as much oil as before. I installed another AOS with the same results. Smoke after a few weeks and oil in the upper tube.

What I learned.. Just because something is called "normal" doesn't make it right. Do I think oil being sucked into the intake is right, no I don't. I went through 3 "good" AOS all with the same symptoms, so I guess it's "normal"

2000 Boxster with 26K. Oil level at full and changed to min with no difference. Oil changed from 0-40w to 15-40w with no differences either.

Hope this was of some help,
Kyle

[Tucker2]

Thanks for this guys. I had an inspection done with a very good Independent after I got my '02 BS. His one comment from listening to the exhaust was he thought the AOS was on its way out.

I ended up taking the throttle body off and yes...there was oil. Not dripping with oil....but a fair amount of oil.

Then I decided to take the throttle body off of my '08 Cayman....and guess what.....EXACTLY the same level of oil.

On both cars there is no excessive vacuum from the oil cap....so I am not replacing the AOS yet on the '02.

I just wish there was a VERY CLEAR description of what the normal level of oil in the throttle body should be. It's been a frustrating thing for me to research.