Engine Overview and Common Failures
The weight of the G6DB engine is 212 kg (with attachments). The engine number G6DB is located at the junction of the engine and the gearbox. The most well-known problem with engines in this lineup is excessive oil consumption, and the main reason for this is the rapid clogging of the oil control rings. Owners of vehicles with this engine constantly perform decarbonizations, but it does not help for long.
There are many cases described online of these engines seizing due to bearing rotation, usually caused by a sharp decrease in oil level due to excessive oil consumption. However, even properly maintained engines can seize, indicating that the bearings may be somewhat weak.
The timing chain in this engine is not particularly reliable and lasts about 100-150 thousand kilometers. Replacement is very expensive, especially if it also requires replacing the phasers. The chains in second-generation engines have become more reliable, but the hydraulic tensioner still has issues.
Other shortcomings include frequent lubricant leaks from plastic valve covers, throttle malfunctions, and breakdowns in the intake manifold's variable geometry system. And don't forget about valve clearance adjustment, which is sometimes required every 60,000 kilometers.