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Originally Posted by tnoice
So question is, would you include changing out the AOS every 60-80,000 miles AND the water pump a good precautionary measure, or is it not needed. Run it till it breaks?
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Yeah, I'd be interested in the answer to that question as well. When the AOS is going, are there sometimes/usually/always some symptoms that, if you're really paying attention, you can notice before having a potentially catastrophic episode like almost happened here?
Jake, I remember you talking about 2 modes of failure with the AOS, each with their own symptoms (white smoke in one case, a high pitched squeal at idle in the other). Are these symptoms pretty much always going to precede the failure?
Might removing the oil filler cap (checking for increased vacuum and difficult removal of the cap) at idle periodically ( maybe monthly??) be a good preventative maintenance measure to keep tabs on the AOS integrity?