The only automatic the 2.5L got bolted to is the 6sp Aisin (09G), never a DSG.
Change the ATF now, as they are often overlooked. Look online for Idemitsu brand TLS-LV fluid. It's [essentially] a Toyota transmission, may as well use the less expensive OEM fluid in it. The Volkswagen dealer will just sell you the same thing in their bottle for thrice the money.
The big common thing on all the 2.5L is the vacuum pump leaking oil. Contrary to what the book tells you, and the dealers will charge you for, you do NOT need to remove the transmission to R&R the pump. You can take the pump partially apart and get it out in pieces. Don't bother buying a new pump, as Pierburg has like so many other sold their souls to China, and the new ones are crap. Just find a rebuild kit:
volkswagen 2.5 vacuum pump rebuild kit - Google Search
... and fix it that way. Get to it BEFORE it starts barfing oil all over the place.
Some other 2.5L tips:
Get the engine code, it'll be one of two, CBTA or CBUA. The code is on the tag in the trunk floor, near the spare tire, or on the valve cover, under the air cleaner assembly. Or the dealer can tell you by VIN. Helpful to know which it is when ordering anything.
They hold 5.5L of 502.00-compliant 5W40 oil, the Mann filter is HU719/6x (Mann makes the filter housing assembly, so best to use that element). Do NOT overtighten it!!!
They can, and often do, consume some oil... until you know that particular engine's appetite, monitor it closely. They have a 10k mile service interval, same as the rest, no need to do it any more frequently, just make sure it stays full.
The air filter is on the bottom side of that giant engine cover, which can stick to the rubber mounts which hold it to the engine... best to pry it up and pop it loose when the engine is warm, you'll need to remove the CT clamp to the air inlet tube to get it loose, as well as a couple little Torx screws at the cold air inlet. Only reason to take that off is to replace the air filter (every 60k) or the spark plugs (every 40k). You'll also need to remove it to access the purge valve, which sometimes fails (right up top).
Ignition coils are somewhat common to fail, so I'd plan on just replacing them at 120k.... they are not that expensive for Bosch ones.
In some cases, if the car maybe wasn't cared for as well as it should have been, the little oil pickup tube can clog up and cause oil pressure warnings once warm... just take the lower pan off and replace that little tube with its little seal. Not hard, pan held on with sealant.
That engine does not specifically require premium gasoline, one of the few VAG engines that doesn't. Don't "top off" the tank.... ever... that just causes the already weak leak detection pump to die faster.
Rear calipers are common, because dipshits don't use the parking brake. This also causes the front brakes to get overworked, which warps the rotors and beats the crap out of the control arm compliance bushings. I do NMS Passat compliance bushings a LOT.
All in all, I'd say that's a good car. Kinda big, so great for rear seat passengers. They can get low to mid 30s on the highway if you Tip it and keep it in 6th and don't go too fast, which is decent for a car that size that is saddled with spark plugs.