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    

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 

Dave

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 

Dave

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  

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.    

Brilliant Paul

Got that filed away with Dr Tranny another one that works

Dave

What additive did you use? Sorry if I'm missing where you wrote it

Morning Alexander

Welcome to the Forum

Paul used Liquid Moly additive I beleive, do remember that if the seals are hardening through age this will work if the seals have gone it can't do much 

Dave