LEXUS GS 350 ENGINE SYMPTOM

At Moderately High Rpms I Can Smell Something From The Engine With The Windows Down, And If I Floor It A Couple Times It Comes Through The...

When I Come To A Stop The Car Slightly Smokes And Smells Of A Terrible Odor Like Burning Oil Or Tar, But The Engine Does Not Overheat. This...

I Have A New 2013 Lexus Gs. Especially During Acceleration I Hear A "shhhh" Sound. I Am Also Getting Poor Gas Mileage. Could This Be...