CITAT(Sorin @ Sep 23 2009, 12:23 PM)

Exact piesa de care povesteam
1L/1000
Typically if you have high oil consumption on that particular car its usually because of a
crankcase vent valve being stopped up. Its not a terribly expensive part, but it is labor intensive. Its located under the intake manifold and connects to the intake manifold, valve cover and the oil pan. It basically separates oil from the vapor in the upper engine and returns the oil to the oil pan. If it gets stopped up, then oil vapors will get drawn into your intake and your motor will burn it (slowly but consistently)
They are very common to go bad every 60 to 80K miles. Also, if you have it replaced, there are several hoses that should be replaced with it (4 total I believe) I'd recommend having an experienced BMW tech perform the repair.
Do you notice if the car idles rough at all? That is usually a sign of a vent valve failure also, since a vacuum leak is usually created by a bad valve. Eventually a check engine light results with lean mixture faults. Also, some oil usually leaks out of the bottom of the valve where the drain hose has deteriorated.
Source(s):
Oare vb despre acelasi lucru?
PE ALT FORUM, acelasi raspuns dat de alt mecanic!
Question - My 2002 325i seems to burn about 2-3 quarts of oil between oil changes. I change my oil between 5-6k miles and I am worried about how much oil it is consuming. What could this be?
Answer - Your car does burn a small amount of oil between oil changes. But the amount your car is using up is excessive. It sounds like you have a clogged
crankcase ventilation valve or hose. This is a common failure point on the M52 and M54 motors. Most of the time the reason these do get clogged up is due to the oil change intervals BMW recommend which can give the valve a quicker build up then normal. The way to fix this issue is to change the valve and the hoses too. The hoses ten to get dry and crack so it's good to do all of them at the same time.
When doing this repair here are some items to change while your there.
Intake Manifold Gaskets
Fuel Injector seals (top and bottom)
Oil Separator Valve
Oil dipstick o-ring
All the hoses connected to the Valve
BMW TECH TIPS!