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Volkswagen Jetta Mk5 (1K)
2005–2010 · 1K · sedan
Mk5 Jetta on PQ35. 2.5L inline-5 base / 2.0T (GLI) / 1.9L TDI diesel. The GLI (2006-2010) is the enthusiast pick — same 2.0T as the GTI. Diesel TDI cars affected by the 2015 VW Group emissions buyback.
Watch out: 2.0T GLI shares Mk5 GTI engine concerns: timing-chain tensioner (TSI revision later helped), carbon buildup, water pump. TDI cars: emissions buyback affected most US 2009-2010 cars. 2.5L I5 is generally durable but unremarkable.
Full clubhouse — owner Garage Lineage, common problems, year-by-year notes, and product picks — is on the build list.
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