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      03-24-2018, 07:33 AM   #23
perry8912
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Quote:
Originally Posted by pits200 View Post
Unlike the n54 and other v6 variants which make walnut blast a tough but not a too difficult job. But on the n63 due to the engine orientation, walnut blasting would be a nightmare and probably why no one has done it.
K, I see. But how to prevent carbon buildup thing happens? Fuel additive maybe? I heard the N55 has less this kind of issues compare to n54, I hope our v8 can do better as well.
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      03-24-2018, 11:20 AM   #24
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Originally Posted by perry8912 View Post
K, I see. But how to prevent carbon buildup thing happens? Fuel additive maybe? I heard the N55 has less this kind of issues compare to n54, I hope our v8 can do better as well.
Drive it hard once in a while to heat things up good. But I think bmw increased the operating temp of their Turbo engines to help prevent carbon buildup.
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      03-24-2018, 11:59 AM   #25
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In a DI motor without a supplemental injector and a wash cycle in place there is no way to eliminate or mitigate carbon build-up.
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      03-24-2018, 12:20 PM   #26
pits200
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Quote:
Originally Posted by turboawd View Post
Drive it hard once in a while to heat things up good. But I think bmw increased the operating temp of their Turbo engines to help prevent carbon buildup.
Never going to create enough heat to have any effect. They wouldn't raise it high enough to be detrimental to other components.
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      03-24-2018, 03:05 PM   #27
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It sounds like a matter of time until the valve stem seals go bad.
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      07-12-2018, 11:30 AM   #28
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I bought my 2013 X5 50i with 56K miles, knowing about the valve stem issue I bought a 3rd party warranty at the used car dealer.

Sure enough at 70K I brought it in and the warranty covered it. But BMW instead replaced the engine with a new one that has a fix for this. They covered 80% of new engine under a one time good faith agreement that had to get approval from headquarters.

Looks like old engine valve stem seals go bad because there is a small fuel leak that degrades them over time. New engine is supposed to have a fix for this.

So chose new engine over warranty.

New engine cost came down from 27K down to about 4K and is now BMWs go to option instead of the 40hr labor needed to replace seals.
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      07-12-2018, 12:01 PM   #29
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Quote:
Originally Posted by THINGMAJIG View Post
I bought my 2013 X5 50i with 56K miles, knowing about the valve stem issue I bought a 3rd party warranty at the used car dealer.

Sure enough at 70K I brought it in and the warranty covered it. But BMW instead replaced the engine with a new one that has a fix for this. They covered 80% of new engine under a one time good faith agreement that had to get approval from headquarters.

Looks like old engine valve stem seals go bad because there is a small fuel leak that degrades them over time. New engine is supposed to have a fix for this.

So chose new engine over warranty.

New engine cost came down from 27K down to about 4K and is now BMWs go to option instead of the 40hr labor needed to replace seals.
Friendo, you are in the wrong forum. You have N63 engine and E70/71 X5. There is night and day difference between n63 and n63tu. No valve issues in n63tu - this already been discussed to death. N63TU is free of such issues. It was fixed on a hardware level with TU (Technical Update) - which was extensive update - basically a new motor.

Some noobies will read this and will continue to spread misinformation and panic.
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