Thanks, everyone. I will try all suggestions but some I have already tried. Seems to start while going striaight, turning or braking doesn't change sound. I am thinking it is an early sign of a axle bearing. Had full service oil change by dealer as I had as I had timing belt and the common leaking head gaskets replaced earlier. They said everything else looked good ( axle boots and suspension). Recently got new tires although old one had even wear but were getting "old". They also said everything looks ok. Actually didn't have the noise after driving home yesterday from work, but didn't use the usual freeway ( short distance, on ramp to next exit.) but drove surface streets home. No noise where when I drove down street by home (20-25mph) or in driveway or garage. These are where I get the squeaky sound.