#1772, "RE: how hard do you drive your A604?" In response to In response to 16
The haaauummmmmmmmmmmmmmm sound you hear when you leave it in 1st/L gear is the engine/tranny whinny since they are at a high RPM. Crusing around at 25Mph in L will make the annoying hhhaaaaauummmm sound. Shift into 2nd or to Drive and it won't happen.
You can also downshift but putting it into L which will slow the car down, but it will make the hhaaaaaauummmm sound since the engine is slowing the car down.