Jump to content

Oil Additives Valve Stem oil Seals Experience N62 Engine


Recommended Posts

HI all, new to the site. I have a great 650i , 2006 done 87K miles, full history which I think is a fab car with the N62 V8 engine. Car does about 3-4K miles a year. Recently I noticed some smoke at the rear which looked like oil smoke and following some research and checking of various breathers etc I pretty much isolated it down to the valve stem oil seals. The smoke was bad enough for it to have failed MOT so I did some digging and sure enough the confirmation was valve stem oil seals.

So what to do?

I went back to the books as it where and came across a series of articles on oil additives that can help rejuvenate tired valve stem oil seals. So at the next oil change I purchased some LiquiMoly product (thought I would trust the Germans) and put this in with the specified oil. I ran the car for about 3-400 miles and the smoking disappeared, to the extent that it passed the MOT also. I know there are a range of such additives out there and to be fair I was a bit sceptical but I now have the proof. Is there any other experience on this with this or other additives as I want to learn more and understand the limits of said additives and when I might have to bite the bullet and replace the seals.

So far so good though and I plan to continue to use said additive with future oil changes .

Would appreciate any experience share    

Link to comment
Share on other sites

  • 4 weeks later...
On 12/17/2020 at 8:14 AM, Greydog said:

Morning Paul

Welcome to the Forum

I can understand a product helping a rubber seal that has hardened, but if the actual guides are worn I am still a skeptic.

From what you write you have had a brilliant result Whoop Whoop enjoy your 650 


Hi Dave, I too was a sceptic but I thought to give it a try. No other symptom other than smoke. if the guides were a problem I might have expected a few more issues I suspect. But for now all is good and I am sold on the additive. Yes, enoying it very much, fab bit of kit  

Link to comment
Share on other sites

  • 10 months later...

Hi , just an update on this valve stem oil seal matter. The 650 i went through a further oil change in July 2021 and then an MOT in Late October. Again, I used the same additive as before from Liqui Moly.  Absolutely no smoke at all in the MOT and it passed with flying colours. I am quite impressed by this additive as it seems to do exactly what it says on the tin.    

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...