Ask dealer :dunno:

 

I asked, he said there should be, but he didn't know the process or for how long.

There is no break-in.

Can I ask where you heard that from? Just would rather be safe than sorry.

Nope, but Mike Miller, BMW CCA tech-editor says warm-up and cool-down is a must for turbo engine. I never shut down my engine right of the bat on hot summer days. @51K-miles, tuned and hard driving my N54 never (or hasn't) develops waste-gate rattle. Knock-knock on woods.

Oh I hear ya, I've been doing that for 4 years on this car. Usually keep it under 3k RPMS for the last 5-10 mins of the drive and vice versa when going out (also wait till temp is at least 240).

 

There is no break-in.

 

Nope, but Mike Miller, BMW CCA tech-editor says warm-up and cool-down is a must for turbo engine. I never shut down my engine right of the bat on hot summer days. @51K-miles, tuned and hard driving my N54 never (or hasn't) develops waste-gate rattle. Knock-knock on woods.

 

Mike Miller, BMW CCA tech-editor says warm-up and cool-down is a must for turbo engine.

This is correct. The problem with a hot shutdown is that the turbo is hot, but the oil flow ceases. So the oil left on the turbo's shaft begins to cook, leaving behind carbon deposits.

The usual solution is to take it easy for the last two minutes of your drive, putting along or idling, before shutting down.

The better solution is an after-oiler, which will keep oil moving through the turbo after the engine has shut down. This continued oil flow will carry the heat away from the turbo's center section, cooling it an preventing carbon buildup.

Frederic

 

Any new rotating assembly should be broken in, just don't flog it for a few hundred miles.

 

This. Says as much in the owner's manual, too.

 

Any idea why your turbos failed?

 

my opinion is evey day you warm them up before you wind them up

 

I thought you were supposed to wait until your oil temp kicks off the left hash mark. This way you know it is ready to lubricate those spinners properly. I always wait and keep it under 3k rpm. The JB4 also has an indicator option for this so you know when you can step on it so I have that activated as well.

 

Engine break-in is, what, 600 mi? Don't go over 4500 rpm? I'd do that if I were you.

Wear surfaces....

What happened to your turbos?

 

You do know the car's electric coolant pump circulates coolant to the turbos after the engine shuts down (when necessary), right? For a street-driven car an after-oiler is pretty much overkill.

 

The engine design explanation even says that it does this to prevent heat soak...I can hear it running sometimes after I shut down when its hot.

Sent from my SCH-I405 using BimmerApp mobile app

 

There is no break in needed for turbos.