I own a 2003 Audi a6 3.0 Quattro. What is the ideal oil temperature on it? When do I change the oil? What type of oil do I use?(10w-40, 5w-30) What Brand? Where do I take my car to get an oil change? Can I take it to Jiffy Lube, Express oil, or Do I have to take it to the dealer? I bought the car few days ago. Is it wise to change oil on it? Please advise.
Thank you in advance

 

Is this the first car you own?
The first car you do a routine maintenance on?
One should follow the owner's manual suggestions!
If you do not have one - then get one, you'll need it(at least there is a procedure how to reset the service light and how to reprogram the key remote).

For the rest of answers you are looking => there is a plenty of info on the forum.
If you have more than one favorite brand of oil - just combine them, make your own blend.

What is an ideal oil temperature - ideal for the environment or for the oil or for..?
State your concerns on the ideal oil temperature!
Climate?