What are know reasons for oil smoke spewing from exhaust at idle?

lack of cats in a boosted car has nothing to do with it. your friends srt had a bad turbo. My car had a 3" catless exhasust and just about every bolton you could have. My turbo never burned oil once or threw any in the hot pipe

Actually his friend just had a normal SRT. SRT's needed catch cans badly or else you would find oil surprises in your intercooler every time.
 
ok now tell me what the pcv system has to do with the compressor side of your turbo?

I was wondering the same. From my understanding, the pcv valve vents back into the air intake for emmision purposes, which in turn enters the intake manifold, cylinders, etc.

I looked for oil in my IC when installing the DP, but did not notice any.
 
The pcv has nothing to do with the compressor side of the turbo s*** nothing does actually. The only way your going to get oil blowing out of the compressor side and into your pipes is A. if your compressor side oil seal is blown B. if your pushing too much oil thru the turbo and blowing it past the seals becuase it cant drain out quick enough. or C. if your return line is kinked. None of the causes of the compressor side blowing oil have ANYTHING to do with the pcv.
 
PCV enters pre compressor. so if PCV is spewing oil it is going to go through everything behind it. my pcv enters right after my maf on my sri so everything that comes out of it will go through that pipe, the pancake pipe, the compressor, the hot boost pipe, the intercooler, the cold boost pipe, through the engine where it should be burnt up put not always, throught the turbine, and then into the cat where it shold be burnt off, if no cats it continues to burn in exhaust and makes a nice cloud of smoke out the tailpipe. bossted cars leak more beacuse there tends to be more blow by into the engine which is pressurized. that presuriced air needs to go somewhere. and when it leves it takes some oil and other hydrocarbons in the cranckcase with it.
 
ahh **** ur right lol i didnt think of that becuase i have krank-vents and a breather filter on my valve cover i totally forgot about the ppl with the breather line hooked back in you could be right. But i also think if you blowing by enough to puddle up in you ic pipes its soemthing more then your pcv
 
PCV enters pre compressor. so if PCV is spewing oil it is going to go through everything behind it. my pcv enters right after my maf on my sri so everything that comes out of it will go through that pipe, the pancake pipe, the compressor, the hot boost pipe, the intercooler, the cold boost pipe, through the engine where it should be burnt up put not always, throught the turbine, and then into the cat where it shold be burnt off, if no cats it continues to burn in exhaust and makes a nice cloud of smoke out the tailpipe. bossted cars leak more beacuse there tends to be more blow by into the engine which is pressurized. that presuriced air needs to go somewhere. and when it leves it takes some oil and other hydrocarbons in the cranckcase with it.

you are looking at it all wrong !! the tube on your intake pipe is where the PCV system TAKES THE AIR IN. it draws it through the the crankcase and into the intake manifold when under vacuum. sometime when airflow characteristics chance it can cause the pcv flow to change too. this sometimes causes the air to pick up oil vapors when it travels through the crankcase. and that is how it gets into motor. if you do infact have oil coming out of the breather port in the intake, that means your PCV valve leaks under boost. but considering most people with this smoke see it at idle it is not a faulty valve. they just need a catch can.
 
you are looking at it all wrong !! the tube on your intake pipe is where the PCV system TAKES THE AIR IN. it draws it through the the crankcase and into the intake manifold when under vacuum. sometime when airflow characteristics chance it can cause the pcv flow to change too. this sometimes causes the air to pick up oil vapors when it travels through the crankcase. and that is how it gets into motor. if you do infact have oil coming out of the breather port in the intake, that means your PCV valve leaks under boost. but considering most people with this smoke see it at idle it is not a faulty valve. they just need a catch can.

The smoke at idle has nothing to do with the turbo seals being busted and needing to replace the seals or turbo itself? Just curious to know.
 
For the records, and I know I am going to jinx myself, but the last 6, 7 times I had the car out.........no trace of smoke at idle. I don't know if it had anything to do with it, but I had the DP sitting in the corner of my garage for half a year, and when I installed it, I used a ton of PB blaster on the studs, nuts, and sensors, which might have been what I witnessed burning off for the first 2 days. However, if I go for a spirited drive one of these weekends and discover that it smokes after coming to a stop, I'll probably be going the catch-can route.
 
Well it seems in my case that the turbo seals are done. I am going to pay the dealer a visit to probably get a new turbo under warranty.
 
i have the smae smoking problem.But i have the corksport tbe no cats.Wheni coe to a stop i get a little puff soetimes of smoke.But if i idle for more than 8 min its staets to smoke liek a smoke screen.
 
if your turbo seals are shot you will see smoke all the time escpecially at heavy throttle. if that is not the case for you, then your problem is oil being sucked out of your crankcase and going into the intake manifold. if your dealership is going to give a you a turbo ....fine, but the smoke will be back.
 
if your turbo seals are shot you will see smoke all the time escpecially at heavy throttle. if that is not the case for you, then your problem is oil being sucked out of your crankcase and going into the intake manifold. if your dealership is going to give a you a turbo ....fine, but the smoke will be back.

I have installed my catch can today to the PCV valve. I am still smoking at idle, but now it is a little bit of both, a lot of smoke and a little. I have driven about 8 miles already today. Will it take sometime for the smoke to stop and go away completely?

Also, would it be wise to put a breather on the Valve cover nipple?
 
as rotus said it was made for 5w-30, I am amazed this is even something thats questioned

Many engine builders and experts believe that 5/40w is preferred for engine life and protection. 5/30 was chosen by Mazda in part for it's gas mileage and emissions improvement.
 
First, to the original poster, I would have your dealer document the fact they put the WRONG oil in your car that is NOT recommended by Mazda and admit that this is a mistake on THEIR part and not yours. Seriously, you need documentation of this. If you've got receipts that say 5W-20, fine, but I would get something that admits that this is a mistake on their part because this could come back and bite you in the ass. If service departments are going to hang you for your mods at the drop of a hat, it's time for the consumer to fight back and play their games.

The PCV valve is a $.02 part. Manufacturers spend thousands on putting emissions equipment on these cars do begin with. They don't want to spend money on a quality check valve. PCV blow by is quite common with factory turbocharged cars, especially when you start modding and running more boost. The PCV valve is a plastic POS. Either try Krank Vents or put a good PCV valve in their like a metal one from a Toyota Supra turbo.
 

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