Blue Smoke right exhaust only
 

Hello everyone;

Wife drives a 2005 X5 4.4i, about a year ago we had the PCV valves replaced because every time she would be at a running the car for a while and would come to a stop it would poof blue smoke, it got a little better right after we changed the PCV valves but now is a lot worse, it even does it when the car just idles, and is only on the passenger's exhaust, when she comes to a stop then takes off a lot of smoke.

So i asked the guy that fixed it before, and said he can't think of anything else other then the valves.

I did a some reading here, and most of the post mention the Oil seperator, would that be the next thing to check on the car?

I need some advice on what could be next.

Thanks!

I would suggest a leak down test to see if your rings or seals are bad.

ok, good start.

assuming no problems found on the test, what could be next?

A good leakdown test verifies no cracks in the head or pistion dome, ring sealing, valve sealing & head gasket condition. A leakdown test will NOT verify the condition of valve guide seals!

If it turns out to be the valve stem oil seals you can add a product to your oil which conditions the seals .
many people have had lasting results .

These products soak into all the rubber item they come in contact with, causing them to swell and become softer. I have heard positive statements about them also. If OPs leakdown #s look good this could be his next option.

I have the same problem the OP described and I went down the same route of replacing the PCV valve because the guy said it was "sticky" and likely the source of the problem. However, I just saw the smoke again a few days ago!

@TiAgX5 - What product are you talking about to recondition the seals?

LubroMoly LubeGuard for one. Just be aware that BMW states that "NO oil additives are approved" for use in their vehicles.

Thanks!

Hi folks,

My X started consuming a lot of oil. Once this happened I would get a lot of smoke coming from the exhaust after idle. Diagnosis was valve stem seals. So I have just started trying an additive that conditions the seals, in Oz its Nulon ESL. I heard positive results from some 7 series N62 owners but have also heard horror stories from non BMW owners. However I am happy to report that so far so good. I have driven 300 km so far and apparently takes full affect at 500 but already my car has almost stopped smoking altogether. Me happy :D