Power claims are cheap. Documentation is rare.

Oiling questions

Buyers often research early crank collar and oil pump discussions. Do not turn that into panic; turn it into questions. Ask whether the oil pump, crank collar, sump, baffles, oil cooler setup, and oil pressure behavior have been inspected or upgraded.

If the seller claims a fix, ask for receipts or workshop notes. If there is no proof, assume you still need a professional inspection and budget accordingly.

Turbo setup and boost history

Factory turbo components and higher boost are a common buyer concern. Ask what turbos are fitted, what boost level is used, who tuned the car, what fuel it runs, and whether there is a dyno sheet or ECU documentation.

• Unknown boost controller wiring is a warning sign.
• Power claims without tune documentation should not raise the price.
• Ask whether the car has been tracked, drifted, or drag raced.
• Confirm supporting fuel, cooling, and ignition work.

Baseline service list

Timing belt, water pump, tensioners, ignition components, plugs, coils, fluids, fuel filter, vacuum lines, hoses, and belts are baseline topics. The exact service interval and parts choice should be confirmed with a qualified specialist, but a seller who cannot discuss baseline maintenance is asking you to buy uncertainty.

A fresh service is not automatically proof of quality. Look for dates, parts used, workshop names, and whether the work matches the car's current condition.

Modification quality

Modified cars can be excellent, but random parts are not a build plan. Wiring quality, ECU setup, fuel system, intercooler piping, cooling, exhaust, clutch, drivetrain, and old alarm installs all deserve attention.

The best modified cars have a coherent purpose and paperwork. The risky ones have expensive parts, no receipts, and a seller who says everything is "probably fine."