iLoad / iMax TQ inspection checklist

Look for: Hyundai's 15,000km/12-month interval is far too long for the D4CB diesel, which is exactly how so many end up sludged and with dead turbos. Many high-km failures trace straight back to extended oil-change intervals.

Look for: A heavy, nose-heavy van works the front brakes hard; pads wear quickly and rotors warp, giving shudder under braking - common on delivery vehicles.

Look for: Light-rear RWD vans can step out or spin up when empty on wet/loose surfaces; early cars lacked the traction/stability aids later models gained.

Look for: The defining D4CB failure: the copper injector seat washers harden and leak combustion gases, soot and unburnt diesel into the crankcase. The soot mixes with the oil, forms hard carbon lumps, sinks to the sump and clogs the oil pickup. Oil starvation then kills the turbo and can spin a bearing or destroy the crankshaft. Symptoms include a ticking/chuffing at the injectors, blackened oil very quickly after a change, and rising oil consumption.

Look for: As with most common-rail diesels, the EGR valve and intake manifold soot up, causing rough running, loss of power and limp mode.

Look for: Once oil flow is compromised by sludge the variable-geometry turbo bearings run dry and fail (smoke, whine, oil in the intake, power loss). The VGT vanes/actuator can also stick with carbon and overboost, with a faulty air-mass meter or turbo relief valve contributing.

Look for: The oil-pump pressure-relief valve can jam open (attributed to rough machining of the bleed holes), dropping oil pressure and, in the worst case, destroying the crankshaft and bearings.

Look for: The wastegate turbo is simpler than the VGT but still fails from oil starvation once sludge restricts flow - whine, smoke, oil in the intake and power loss.

Look for: The manual's dual-mass flywheel and clutch wear out, especially on vans used for stop-start delivery work, giving rattle at idle, shudder and slip.

Look for: The wider Theta II 2.4 family has a documented history of connecting-rod bearing wear and bottom-end knock (subject of recalls/extended warranties on other models). Reports in the iLoad/iMax are limited, but neglected oil changes raise the risk.