Mechanical
DSG / DCT (Dual-Clutch Transmission)
A computer-controlled twin-clutch auto used in VW Group, Ford PowerShift, Hyundai N and others.
DSGs shift fast but have a poor reliability reputation: mechatronic unit failures (VW), shuddering and clutch wear (Ford PowerShift). Repair costs run $3,500–$7,500. On a PPI we drive in slow stop-start traffic to surface the symptoms a quick test drive won't.
Related terms
CVT (Continuously Variable Transmission)
A belt-and-pulley auto box used in many Nissans, Subarus and Hondas — known for early failure under load.
Transmission fluid check
Colour and smell of the ATF/DSG/CVT fluid is a leading indicator of internal wear.
DPF (Diesel Particulate Filter)
A soot trap in modern diesel exhausts that requires periodic high-speed driving to self-clean.
EGR (Exhaust Gas Recirculation)
An emissions valve that routes exhaust back into the intake — a notorious carbon-clog point on diesels.
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