What is the reason for it???

how come evreytime i turn a honda cr-v 2001 steering wheel all the way it make's a sound like a screching sound i put oil to lubricate it but still can any1 please help me

Hard to say without hearing it. The steering wheel itself make noise or while driving? Explain.

When you say all the way I'm guessing that your pushing the steering gear to the end of its travel. My guess is a loose/bad P/S belt, or you may be hearing the relief valve in the P/S pump. The valve opens to keep you from blowing the P/S hoses off the car. Hope this helps.