Guys, I think I may have resolved the problem (what would i be without you!) As BKS mentioned that this might as simple as the tyres and TJ sed that the Michellin Energys are known to have issues, I included "a rotation of the tyres" as the 1st thing on my diagnostic flowchart. As i did the rotation this afternoon, the whirling noice somehow changed its charactaristics. ie. noise doesn't kick off at around 70km/h anymore, souce of noise moved from front to somewhat back, steering left or right has insignificant impact on the noise intensity etc. So I think (and i hope i m right) it would be the tyres. I still have to do some more trials at highspeed to be completely satisfied!!! But like i said, What would I be without you guys!!!!! As an added bonus, I also identified the source of engine oil leak! its from the oil sump seal (I believe there is no gasket, right?). so it would be easy to fix. Now, the next thing is the drivers side headlight! it has condensation during rain or carwash. I have checked for any cracks or holes and found none. do you think its the seal? btw TJ, which one is it (just in case if I still needed to drop by)? 1. Goodyear Autocare Bankstown 326 Edgar Rd, CONDELL PARK, NSW, 2200 Phone: (02) 9790 3919 Open: Mon - Fri 8am - 5pm, Sat 8am - 12 noon 2. Goodyear Autocare Smithfield 26 Victoria St (Cnr Little St), SMITHFIELD, NSW, 2164 Phone: (02) 9609 4477 Open: Mon - Fri 8am - 5pm, Sat 8am - 12 noon 3. Goodyear Autocare Auburn 2A Silverwater Rd, AUBURN, NSW, 2144 Phone: (02) 9737 9308 Open: Mon - Fri 8am - 5pm, Sat 8am - 4pm sorry for this long post fellas. And thanks for your patience!!!!