The main issues in the MK6 from my knowledge aside from the TDI specific ones are the clock spring, headlights burning out for some reason (that crackhead owners are too lazy to replace), and water getting into the low mounted blower horn and killing it. You can replace them with disc horns and it won't kill it as easily.
nostr:npub14rpplnv2586ta7apf4e0c7spywthxtfsmze3xxhezfjz70rjdafqc7497x nostr:npub10phuvttajmstrephkpz9dr35l7ls9cq5af3vw2tyua4lyzgxmnzqv2mlal nostr:npub1scjc2e839xfmmsjfqr87huvu9qxenptmamfrcj6s98gv6frq5wgqh0el3p nostr:npub1sl8kylr2n9gpnfdg5k5jv9dwda5xm9chuyt73gz4mcl88q5fa0tser5emg huh, the most i know that the mk3 suffers from is the shitty alloy it has for front quarterpanels and maybe other body parts so they rot easily
Discussion
Also this was before they began to have the shitty "network connected" stuff in the cars (which no longer works on the MK7 because of the 3g shutdown LOL), and it's the last gen based on the PQ35 platform (which lasted a long time in the USA market because of the Passat). There's lots of jank shit on upgrading head units with later ones that cost tons of money because it also has to be "unlocked" (you can't just pull one from a junked car).