BMW M57N2 Oil Catch Can (You Don't Need It)

[@lemeister3032]

Can instaling a vortex breather stop or atleast reduce oil consumption? I had a turbo rebuilt and i still have oil consumption and also leaking oil from bottom of hose from intercooler to intake manifold

[@ShadetreeRoadsideRepairs]

I believe it's worth to try it. However, if you have swirl flaps, I wouldn't install the vortex filter. Have you replaced intercooler seals? They can leak even if the turbo / breather are good, there is always some small amount of oil in the intake (like one little spoon). There is a chance that you have old oil in the intercooler. If that's the case, it's worth to unmount it and clean. I would clean the intercooler, replace the seal of the pipe to the intake manifold, and run the car without the charge pipe to the intercooler to see how much oil turbo throws on, say, 2k rpm. It's enough to just start the car for 1 min, rev it to 2k for like 15-20 seconds. You can put a bag on the turbo output pipe to catch the oil.

[@ShadetreeRoadsideRepairs]

How much oil it consumes for 5k or 10k km?

[@lemeister3032]

​@@ShadetreeRoadsideRepairs consumes about half a litre on 1200ish kilometers, i added the breather as I had a new one that I never fitted ( case was empty from factory) and I will see if it helps at all. I dont have swirl flaps as my car is a 325d and they dont have those.

[@ShadetreeRoadsideRepairs]

I doubt the breather would help then, it sounds like a more severe issue. Even without any filters there, it won't be even near 500ml/1200km. Since you said you saw the oil leak at the output intercooler pipe, I would check the turbo again. Evaluate its play and check the amount of oil in its housing, even if it was rebuilt. Off top of my head, if it's turbo, perhaps sometimes you can see blue smoke, e.g., you stop for a couple of minutes, and then foot to the floor, and you might see some blue smoke. Other ideas, I had similar consumption when I had the crankshaft seal leaking, but it was visible. If it's not turbo, no visible leak anywhere, and the breather you installed doesn't help at all, then it's smth even more severe. Could be worn out rings, blown head gasket, or valve guides. I would check the amount of blow-by gas from the brearher and perhaps check the compression.

[@alexcucala]

Put thicker oil, if you are using 5w30 put 5w40 ​@@lemeister3032