Used Toyota Innova Crysta in Patna

— The 2.4L GD diesel turbo is robust but can develop oil seal leaks at high mileage (1,00,000+ km), especially in vehicles that skipped oil changes or used non-Toyota oil. Blue/white smoke on cold startup that clears after 30 seconds may indicate worn turbo seals. Persistent smoke at all RPMs is a definite turbo failure. Check under the bonnet for oil residue around the turbo housing and intercooler hoses.

— The 6-speed torque converter AT is generally reliable, but some high-mileage units (80,000+ km) develop a shudder during 2nd-3rd gear upshift, especially under light throttle. This indicates worn friction material in the torque converter. If shifts are consistently delayed by 2-3 seconds or the transmission 'hunts' between gears on gentle inclines, the valve body may need servicing. Do a proper test drive on both city roads and a highway on-ramp.

— The Crysta's monocoque chassis is well-protected from the factory, but cars from coastal cities (Chennai, Mumbai, Kochi) or flood-affected areas can develop structural rust underneath. Get the car on a lift and inspect the subframe, suspension mounting points, and floor pan. Surface rust on bolts and heat shields is normal — flaking rust on structural members is not. A flood-damaged Crysta with electrical gremlins is a money pit.