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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
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2000 Boxster 2.7
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