This applies to all BMW vehicles equipped with a turbocharger. The customer may complain about a loss of performance and turbo noise. The turbocharger oil supply may be restricted, causing oil starvation and resulting in the seizing of the turbocharger assembly.
Upon replacement of the turbo, always clean the surrounding areas where the engine oil supply and return lines enter the crankcase. Ensure that no debris enters the engine oil supply or return galley.
Remove and inspect the engine oil supply and return lines for blockage/restriction. Make sure that lines are not kinked or collapsed. Replace the lines and banjo bolts (if applicable) if a blockage is found. On gasoline engines, before installing a new turbo, pour a small amount of engine oil into the turbo oil supply hole to provide lubrication during the first start-up. On diesel engines, pour turbo additive P/N 83 19 1 362 168 into the turbo oil supply hole prior to start-up. If the diesel particulate filter (DPF) is contaminated with engine oil due to a failed turbocharger, a diesel particulate regeneration should be performed after the new turbo is installed.
