Bmw Turbo Repairs
Bmw Turbo Repairs
Bmw Turbo Repairs
Bmw Turbo Repairs

BMW Turbo Reconditioning

BMW and turbo reconditioning seem to go well together in the same sentence these days, so we decided to create a small website dedicated to BMW turbo reconditioning. Lets start at the bottom of the scale, Bmw 320d was fitted with a Garrett turbo which seems to handle a fair amount of stress, but around 2005 they started using a Mitsubishi turbo and that's where Bmw320d turbo reconditioning started to escalate. The Mitsubishi turbo uses a semi floating bearing arrangement as the Garrett turbo uses a full floating bearing, the full floating bearing arrangement seems to be the stronger of the two.

We cant blame it all on the design of the turbo, engine oil and condition of the oil plays a very big part. A diesel engine will produce a lot of soot type gases which make there way into the oil via the piston rings in the engine, these gasses are vented back into the engines induction system via the crankcase breathing system. This means the oil is constantly getting bombarded with these gases and lead to oil degradation. Dispersant and additives in todays engine oils keep the individual soot particles from forming damaging clumps. Excessive soot levels in the oil can quickly overwhelm the dispersant and additives in lower quality engine oils and ultimately form what is commonly known as sludge. As the dispersants become depleted, the soot particles clump together, attach themselves to engine surfaces, and lead to reduced lubrication. Once this happens then the turbo on your Bmw320d will start to fail.

Bmw 330d and Bmw 520d our fitted with a much bigger Garrett turbo which can handle a lot of abuse but with every big diesel engine there will always be a lot of soot getting into the oil which will increas the chance of sludge. On the Bmw 330d and Bmw 520d there is a crankcase breather which allows the crankcase gases into the induction system, if the engine suffers from a build up of sludge then the breather can get blocked which will cause the crankcase gases to vent through the turbo. This will cause the engine to empty it self of oil and cause the turbo your BMW to fail or in a worse case the engine could seize, a common symptom of turbo failure on the Bmw 330d and Bmw 520d is the turbo starts to whistle, the longer you leave it, the worse the turbo whistling noise gets and eventually the turbo will fail.

Now that you know the cause of your BMW turbo failure lets look at some prevention methods you can put into practice once you have got the turbo repaired on your BMW. The main thing you need to address is the engine oil,(ie) the condition of it and how long its been in there. BMW recommend using long life oil which is not due to be changed at about 12,000 mile intervals, the problem with this is the oil is constantly getting bombarded with crankcase gases creating soot particles and leading to sludge, the only way to prevent this is to ignore the long service intervals and change the oil and filter every 6000 miles.