BMW e65 750i Valve Stem Oil Leak Issue - Bimmerfest - BMW Forums

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7 Series - E65 / E66 (2002 - 2008)
Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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Old 09-23-2012, 09:44 AM
RichardParry RichardParry is offline
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Location: United Kingdom
Join Date: Feb 2007
Posts: 74
Mein Auto: BMW E65 750i
BMW e65 750i Valve Stem Oil Leak Issue

Hi All,

I wonder if you could help please.

I have a 2005 UK BMW E65 750i with the N62B48 engine. It has what I have been advised as a valve stem oil seal leak on one of the banks. It's been an issue for almost 2 years now, burning oil while idle (causing it to blow out smoke when driving off after sitting in traffic etc).

I have had the CCV valve replaced on both banks as good measure - it was in fact torn.

Unfortunately the smoking is getting rather bad, with it going through around 2-3 litres of oil a month now (I do on average 1000 miles a month) and its very embarrassing to cause "smoke bombs" when pulling away.

I am in the UK and finding it extremely difficult to find anyone who can help. I have been to independent engine specialists, and none of them have the right tools, or say its too complex a job to change the valve stem oil seals. I have been to loads of independent garages in hope they could recommend someone, and everyone they do cannot help.

I am loathed to go to BMW direct for this, as I am sure it would cost in the thousands of pounds to get fixed, and no doubt they will make this overly expensive by saying things like the engine must come out etc etc.

Could anyone help recommend someone in the UK who can complete replacing the valve stem oil seals on both banks, for both intake and exhaust?

Thank you! Richard
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Old 09-28-2012, 09:15 AM
phil996 phil996 is offline
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Location: wasshington DC
Join Date: Sep 2012
Posts: 5
Mein Auto: '06 750i( E65)
sorry, not just the stem seals , its the valve guides too per my BMW dealer buddy, and they cant be repaired, non repalceable guides. new heads $7000 per US. I EXACT same issue with my 06 750i with 191,000 miles. secondary air next to start clogging up ( thats fun) No way I'll spend $14k parts plus labor to fix. looking for a used motor or a very talented machinist who can repair. have not found one yet.
Rediculous to spend 77,000 US new and have a smoker, Embarrasing and a rip off. Mercedes don't do that !!
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Old 09-28-2012, 10:21 AM
RichardParry RichardParry is offline
Registered User
Location: United Kingdom
Join Date: Feb 2007
Posts: 74
Mein Auto: BMW E65 750i
Thanks for the reply.

I have read that it could also be the guides that have gone, but have seen other forum users have had the old guides bored out and new ones fitted, so this doesn't seem too difficult. You're right though, you need to find someone with the correct equipment to do this.

I did spot a second hand 650i N62B48 on eBay UK, which I am interested in. It's done 68k Miles and I would imagine will be a direct replacement. From a newer '07 650i, but generally the engine mechanics should be the same you would have thought. I will check with the seller this doesn't have any issues with smoking, otherwise no point.

Does anyone know of a company in the UK who can help with the oil seal replacement, and if possible also the guide replacement on both heads?

Thanx, Richard
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