My ibiza 2008 1.9tdi pd has started making a different turbo sound when the engine is at normal running temperature. When it is cold the turbo still makes the whistling sound, when warmed up the turbo makes more of a whining sound. It has full service history and has done 102000 miles. Had it remapped 2 years ago to 130hp by evolution chips. The whining sound is not loud and is only audible with the window open. The engine is not using any oil. I use turbo cleaner in the diesel periodically. The performance is good as usual. Anybody else experienced this with variable vane turbos?