Buying due diligence: oil pressure, injection pump, chassis numbers

Experienced buyers zero in on warm-idle oil pressure (a healthy warmed-up car reads around 2.5 bar) as low pressure signals an expensive rebuild, and warn that the injection pumps on injected cars 'cost a fortune.' Verifying identity matters: the true chassis number is stamped on the right frame rail with a separate coach tag on the A-pillar, and at least one auction was withdrawn over a mismatched VIN. Comprehensive documentation such as a Kardex or Heritage certificate is expected at six figures.