2006 xc70 engine whistle.....
 

Hi, I have a 2006 XC70 that I just picked up from getting a new (used with 24,000 miles) engine. At about 60,000 miles my engine failed, random, no issues previously. When my engine failed, I heard a loud whistle in the engine, but never before. Like a loud, exaggerated turbo whistle or whine. So I had the new engine installed and now, I hear a quieter version of that same whistle or whine as I am accelerating. It's not super loud, it's just annoying. If I am in neural and revving engine, I don't hear, just when I am in drive. Even at 5 mph. Is this normal, should I be concerned? The mechanic said it seems like normal turbo noise, but it wasn't there before. Please help. I checked the steering boot by my petals and that seal is intact. Before I go to the dealer, I'd like to have some time to research any possible issues.

Thanks.

Also are there any recommendations for reasonable and reliable extended warranty companies? I'd like to buy one.

I have the same issue..... no answers yet - just empathy.