Turbo exhaust turbine discoloration

[GuyLedouche]

Is this green color a normal discoloration or indicative of something abnormal? 33k miles and 20ish track days on these stock turbos.

[Schemxr]

that’s the first time i’ve seen this. have you had any loss of performance or it’s just the color you’ve seen change

[Rob@RB]

Use any fuel additives, octane boosters, etc? Never have seen green but usually orange/red'ish with octane boost. Coolant can be green but you'd probably know if you had an issue there. Definitely odd but in for the answer.

[Track/S]

Did you have problems with coolant loss? Yesterday I disassembled an s55 turbo with the same color turbine.

[M3SQRD]

I’ve never seen a green turbine. However, sounds like track/s has come across this - was/is your TMIC leaking?

[GuyLedouche]

Originally Posted by Schemxr

that’s the first time i’ve seen this. have you had any loss of performance or it’s just the color you’ve seen change

I had 2 spark plugs ceramic separate so replaced those and injectors. Since it's winter I decided to pull these off and check them and do some preventative maintenance.

[GuyLedouche]

Originally Posted by Track/S

Did you have problems with coolant loss? Yesterday I disassembled an s55 turbo with the same color turbine.

No coolant loss on high pressure side. Slight loss on low pressure side so I replace the TMIC. This was a few years ago and with blue coolant.

[GuyLedouche]

Originally Posted by Rob@RB

Use any fuel additives, octane boosters, etc? Never have seen green but usually orange/red'ish with octane boost. Coolant can be green but you'd probably know if you had an issue there. Definitely odd but in for the answer.

Nope. Just run 93 pump gas.

[Track/S]

Originally Posted by GuyLedouche

No coolant loss on high pressure side. Slight loss on low pressure side so I replace the TMIC. This was a few years ago and with blue coolant.

Then it's not a cause for concern.

[Rob@RB]

As mentioned above the TMIC leaking seems to be the most plausible, I'd definitely keep an eye on that fluid level. The blue coolant could be morphing into this blue/green look among with general combustion turbine discolorations.

[Track/S]

Originally Posted by Rob@RB

As mentioned above the TMIC leaking seems to be the most plausible, I'd definitely keep an eye on that fluid level. The blue coolant could be morphing into this blue/green look among with general combustion turbine discolorations.

The low pressure part does not enter the intake, I think this is what it refers to, i guess it was leaking outside.