faint

when i start my car up its recently started to do the warning beep but i couldnt see anything on the dash. today i noticed the engine oil light on REALLY faint in orange. Im going to put some oil in tomorrow but have no idea what has been used previously. any suggestions? also any reason...

ok so i have a CAI on my car and my DV is bloody loud down it but just lately when ive jet washed my car get in n go for a drive it is very very faint you can barely here it any idears people :help:

Not really a problem , Just wondering what the faint whistling was when im changing up the gears. its only audible when the windows are down. Sounds really nice! Like a tame dump valve i guess. I own a 2002 tdi mk4