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People have gone over 200K on original turbos...rare but possible.
I put (at least) the third turdbo in my 245Ti at about 170K right after I bought it. I say "at least" because the one I removed was water cooled...so it wasn't original. The old one spun ok and didn't blow much oil but the manifold and turbine housing had some nasty cracks. I'm now at 216,500 miles and doing great.
It really isn't that hard to make them last...but like most used cars I have bought, the PO had negative IQ's. I mean the instructions are in the glove box manual. (Really I'm the moron for buying cars from people with IQ's on par with small amphibians)
1) Always idle the the car down prior to shut down. A decent amount of time after hard drives....not as long required if you idle a few blocks putting into your neighborhood.
2) Always, always use synthetic oil. Ever notice the very short oil change interval recommended for turbos? This is because, even with idling down, turbos literally destroy petroleum based oils in short order. No thanks.
3) Never go into full boost until car is nicely warmed up.
4) Always pay attention to noises, and pop the hood at least twice a week to see that all your nice handy work is holding up. Don't wait to analyze a potential "problem".
Your whine may NOT be your turbo, but a turbo hose with a small hole howling under pressure. If you haven't yet, remove all hoses before and after the intercooler and inspect the under parts, especially where the hose clamps go....tip: look on the inside of the hose, if you suspect a crack, it is a crack under boost.
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