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Originally Posted by mit6725
Thanks to everyone for the advice. This whole thing blows my mind...car's running perfect, do an oil change, change the air filter and you end up with this????????? Makes no sense.
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I had similar symptoms. Can ran great till I did an oil change. Filled the oil till it was full from the dipstick and the oil level sensor from the dash. It took 9.5 quarts. AFter awhile the car started to leak oil on the right side valve cover gasket. Then it started to run rough when cold. It ran fine while it was warmed up. Then it started to run really rough when cold and eventaully I started to have smoke at start up. I ended up replacing the AOS. Once replaced it ran like a champ.
My take is your oil is overfilled and may have rujined your AOS. I drained my oil and I now keep my oil level only at 1/2 full at the dipstick and the dash sensor level.