Hall, I have a few wee questions about sorting my new (to me) A4 Avant, 2.4 SE.

1 - Radio in "safe" mode, the previous owner has lost the code and wondered if/where I can retrieve it from?

2 - I am planning on servicing the car this weekend, oil & filter, plugs, Air filter. Can you tell me what oil I should use (grade, manufacturer etc....) planning on a fully synthetic.

3 - It has the Auto/Tip box, all is good 95% of the time but seems to "hold" gears a little longer than necessary sometimes?? Can anyone shed some light on this? Also, I was planning on changing the gearbox oil but after a quick "Google" search, seems it's not as straight forward as I'd hoped, any suggestions as to whether i should or shouldn't do this?

Many thanks in advance.