The car is 06 m5 with 92k miles on it. When it idles you don't see the smoke that much but when i rev it up to 4-5k rpm you can see the smoke come out like crazy. Plus i am losing a lot of oil the consumption is crazy on 40-50 miles it ate up around .5-.7 liters of oil. Is it the piston rings or the seals? Any help would be appreciated.
don't remember the sequence but it was something like if you blow smoke during acceleration its valves and during deceleration it's rings. Or vice versa. regardless, if switching out to a different oil doesn't cure your woes then your looking at engine work. Good luck and keep us posted.
I am using the standard 10w-60 oil castrol. I changed the oil 1 month ago but i have been keep adding on it because it is burning crazy when i drive i dont drive it now because of the oil issue i am having. Its blue smoke when it idles you cant see much but when i rev up its crazy and it smells like burning oil.
It appears to be something mechanical then. The easiest and 'cheapest' thing to check might be the whole CCV circuit looking for issues there relating to if the excess oil is cleared out and returned to the sump properly, no?
Its coming out even on both sides of the exhaust pipes. When it idles you see some come out but as i rev up its a lot. I will try to get a video of it if i can to show you guys what i mean. Also to address the ccv that Gmak talked about i have changed the non return valves on both sides of the engine.
here is the part that i changed please let me know if you were referring to this thanks
Yep. That's it. I really hope I'm wrong - but it's starting to seem like something bigger like valves or rings - as Thumper600 said. IIRC, I read that these cars are known for 'ring leakage'. I hope I'm wrong and that it's something relatively simple.
Would issues in the whole VANOS pump mechanism / hose lead to this? I'm just thinking out loud, here.
Well, not all rings are going bad at the same time I would imagine. Unless the engine experienced bad treatment such as the wrong oil or the like. It would just be one bad cylinder in the bunch? Hence my tail pipe question. Did this come on suddenly or gradually? Is it running smoothly?
So given that both pipes put out the same amount I would suspect it is a common to all cylinders problem.
The oil pan should be under slight vacuum driven by the plenum attachment. Have you pulled off all these hoses and see if they are backed up? Did you pull off the plenum and look down the throttle bodies. Any of them particularly dirty?
Does it feel down on power? When you pull the oil cap off with the car idling does smoke blow out of there like crazy? I would say get a compression test done and go from there.
Pull the spark plugs and check each one for oil on them. This will give you an idea if it is 1 cylinder or all of them.
Check the throttle body butterfly's to see if they are dirty and covered in oil.
Your going to have to take apart parts of the engine to find out where it is coming from, no way round it.
Thanks guys for all the help and useful information that you guys give me.
This is what i did. I pulled everything off the engine took the spark plugs out and did a compression check. The Cyl 5 spark plug was covered in burned oil. The results are CYL 5 compression 30 and the rest were all 90 i checked every single one. So now the question is what am i going to expect to be changed and how much money wise?
Thumper i dont smell any oil from under the hood. By saying the ventilation is clogged how do i go about cleaning that?
As mentioned i have already changed the non return valves and that didnt help.
The power is still there to be honest since i dont really drive the car aggressive i can still feel the power being there. By saying expensive how bad is it? $4-5000 in parts because the clutch and smg is brand new.
Could be as easy as a valve spring. OP, try a "wet compression check" by putting a couple of ounces of oil in the spark plug hole on that cylinder and seeing if compression increases. If so, the problem is likely the bottom end (ring/cylinder wall). If it doesn't change at all, it's likely the top end and could be a valve or spring.
But what explains the oil on the spark plug? If it was just a bad valve spring, I agree no compression. But there should not be any oil in the chamber?
Put a borescope down the spark plug hole and look. Make sure the piston is at BDC.
jcolley thanks for the reply. I will do the oil test tomorrow in the morning. And to answer RT it actually was carbon on the spark plug when i put a boroscope to look at it there was no marks of oil on that cylinder and it was build up carbon. All the cylinders actually had some type of build up carbon on it. I dont think that the cylinder is toast nor the motor because everything functions normally besides the oil consumption. Test will tell tomorrow i will keep you guys posted on this journey that i am having with this car.
Blue smoke on decel- valve guides/valves
blue smoke while revving- rings
A compression and leakdown test for $200 will tell you all you need to know
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