I did it myself. My experience with the parts department at my local VW shop was not inspiring:
me: Need oil and filter for 2010 golf TDI
them: Okay, uh, lesee... synthetic oil. 5w40. got your VIN?
me: Yep, here it is (feeling positive at this point)
them: Okay, good thing I checked. I had the wrong filter.
me: Ohhhh....
[I get out to the car. Pull out the manual and double check the VW spec (507) of the oil. Look at the oil I bought. Nope. 505. Back in I go...]
me: Sold me the wrong oil. Needs to be 507.
them: Oh dear. Sec... Ah, you need the 5w30. (rummaging around in the back). Here it is!
other person: (yells from out of sight): Is this for a 2010?
them: Yes.
other person: No no no. It's gotta be the oil for a clean diesel. It's (long part number)
them: Okay!
[brings me the oil]
Bottom line: It's in a gold bottle. If it is not absolutely clear that it is for a clean diesel you probably have the wrong oil. Oh, and get 5 litres, at least they got that part right. It takes about 4.2 litres to do the change so the 5th bottle will probably do you for a few changes.
The oil filter is accessed from the engine bay (not from below). You have to pull off the cover (pull gently at all four corners of the cover, one corner at a time). It is front center-left of the engine (if you're sitting in the car). Standing in front of the car looking at the engine bay it is center-right. Large black cap. I could not find a wrench large enough for it (it is at least 24mm) so I used a large pair of pliers. This actually worked really well as the cap is not on very tight. I am going to try to find the right tool for this job, but I would do it again with pliers.
I was relieved to see that the oil filer I took out was identical to the one I was putting in. It has a crazy dense zig-zag pattern on it, unlike the vertical folds you typically find on a canister filter (like my 2005.5 passat TDI or my old 1994 Corrado). The old o-ring looked fine, but I replaced it with the new one anyway.
I put in 4 litres, took the car off the ramps, let it sit and checked the level. Near the bottom of the stick so added a little oil, ran the engine, then let it sit and checked it again. I had to do this twice before I got the oil exactly where I wanted it.
As for the oil that was in the car from the factory, I checked the level when I first got the car and then again before I did this change (@ 15,000kms) and as far as I could tell they were exactly the same. Happy happy.
One last note: I like to take the shroud off the bottom of the car and change the oil through the drain plug as that gives me a chance to inspect the bottom of the engine. Everything looked really good, but I did notice that the three rear screws for the shroud were very tight (at one point I was worried I was going to break one of them getting it off). When I put them back on I hit them first with a little WD-40 and they went on much better. There was enough screws involved that I'm pretty sure if you were getting this done at a dealership or service station that *someone* would eventually not bother putting them all back and you would end up with the shroud flapping madly as you drove down the highway like the woman in the 2010 golf I saw on the 407 the other day. If you get your oil changed somewhere at the very least check under your car to make sure they put all the screws back...
me: Need oil and filter for 2010 golf TDI
them: Okay, uh, lesee... synthetic oil. 5w40. got your VIN?
me: Yep, here it is (feeling positive at this point)
them: Okay, good thing I checked. I had the wrong filter.
me: Ohhhh....
[I get out to the car. Pull out the manual and double check the VW spec (507) of the oil. Look at the oil I bought. Nope. 505. Back in I go...]
me: Sold me the wrong oil. Needs to be 507.
them: Oh dear. Sec... Ah, you need the 5w30. (rummaging around in the back). Here it is!
other person: (yells from out of sight): Is this for a 2010?
them: Yes.
other person: No no no. It's gotta be the oil for a clean diesel. It's (long part number)
them: Okay!
[brings me the oil]
Bottom line: It's in a gold bottle. If it is not absolutely clear that it is for a clean diesel you probably have the wrong oil. Oh, and get 5 litres, at least they got that part right. It takes about 4.2 litres to do the change so the 5th bottle will probably do you for a few changes.
The oil filter is accessed from the engine bay (not from below). You have to pull off the cover (pull gently at all four corners of the cover, one corner at a time). It is front center-left of the engine (if you're sitting in the car). Standing in front of the car looking at the engine bay it is center-right. Large black cap. I could not find a wrench large enough for it (it is at least 24mm) so I used a large pair of pliers. This actually worked really well as the cap is not on very tight. I am going to try to find the right tool for this job, but I would do it again with pliers.
I was relieved to see that the oil filer I took out was identical to the one I was putting in. It has a crazy dense zig-zag pattern on it, unlike the vertical folds you typically find on a canister filter (like my 2005.5 passat TDI or my old 1994 Corrado). The old o-ring looked fine, but I replaced it with the new one anyway.
I put in 4 litres, took the car off the ramps, let it sit and checked the level. Near the bottom of the stick so added a little oil, ran the engine, then let it sit and checked it again. I had to do this twice before I got the oil exactly where I wanted it.
As for the oil that was in the car from the factory, I checked the level when I first got the car and then again before I did this change (@ 15,000kms) and as far as I could tell they were exactly the same. Happy happy.
One last note: I like to take the shroud off the bottom of the car and change the oil through the drain plug as that gives me a chance to inspect the bottom of the engine. Everything looked really good, but I did notice that the three rear screws for the shroud were very tight (at one point I was worried I was going to break one of them getting it off). When I put them back on I hit them first with a little WD-40 and they went on much better. There was enough screws involved that I'm pretty sure if you were getting this done at a dealership or service station that *someone* would eventually not bother putting them all back and you would end up with the shroud flapping madly as you drove down the highway like the woman in the 2010 golf I saw on the 407 the other day. If you get your oil changed somewhere at the very least check under your car to make sure they put all the screws back...