litton wrote:
OK, it looks like I may have found the problem. I started to think that this problems came about shortly after I changed the CAC hose so I went out and checked them. It seems that he outlet at the cooler was leaking due to the hose clamp being installed a bit crooked. Found oil by the hose connection and the clamp wasn't tight. Repositioned the clamp and tighten it securely. Also found that he input hose had move back a bit on the neck and repositioned it and tightened the hose clamp.
Now all seems to be well.....no whine and perhaps even a bit more power. Looks like a leaking CAC hose can cause a whistle. As for the oil drops, they were directly under the CAC hose so that issue should be resolved also.
Provent or other oil separator might be a good investment to keep the oil out of your intake.