[lron2154]

my car has been smoking every time i come to a stop light or a stop sign and its getting annoying i check my oil and it was missing a QT so i add and a week later its missing Qt again and it wont stop smoking i talked to a few people and they said it could be valve seals but i was Reading it could be the oil breather/separator from the crankcase any ideas?

[Seattlesquash]

Originally Posted by lron2154

my car has been smoking every time i come to a stop light or a stop sign and its getting annoying i check my oil and it was missing a QT so i add and a week later its missing Qt again and it wont stop smoking i talked to a few people and they said it could be valve seals but i was Reading it could be the oil breather/separator from the crankcase any ideas?

Hate to say it, but does not sound that good. How many miles on car? Did you do a leak-down/compression test on each cylinder. I have an B7 RS'4 which is horrible on carbon buildup/oil and I go through 1 quart/2500k and as I know the 335's you should be way less than that.

[NiNeTyOne]

Mileage, leakdown, the next place to look would be turbos. When the CHRA's start to go they can leak a ton of oil through the seals.

It's not good either way.

[BeastMode335i]

Turbos, I had the same problem.. Drop your downpipes and check for oil before you go digging your motor apart thinking it's valve seals..

[lron2154]

it has 109k miles

[muncie21]

I'd check the plugs for sign of oil burning. If the plugs are clean, next candidate would be the turbo seals.

[lron2154]

So let's says the turbo seals are done for is it better to get new turbos or just replace the seals?

[muncie21]

Originally Posted by lron2154

So let's says the turbo seals are done for is it better to get new turbos or just replace the seals?

Use it as an opportunity to upgrade the turbos

The decision to rebuild/replace is going to be dependent upon who is doing the work. If you are removing the turbos and rebuilding them yourself, you could do it fairly reasonably. If you're paying for someone else to do the work, you may be better off investing in upgraded turbos, seeing that the $1000/labor is going to be about the same either way.

I'd feel better about spending a grand to have turbos installed if I knew I was getting better/upgraded turbos.

[lron2154]

Originally Posted by NiNeTyOne

Mileage, leakdown, the next place to look would be turbos. When the CHRA's start to go they can leak a ton of oil through the seals.

It's not good either way.

What's the CHRA?

[NiNeTyOne]

Originally Posted by lron2154

What's the CHRA?

Center Housing Rotating Assembly

The guts of the turbo.

Most CHRA's are about 1/2 the cost of new turbos. Simply replacing them essentially gets you a brand new Turbo. It's also rarely necessary to replace the housings, and it's a great excuse to disassemble and coat the hot side with a high temp ceramic coating, which improves spool and reduced under hood temps significantly.

Here's a pic of an old CHRA I replaced years ago (ignore the motor mount):