Hello. I know that this will almost be like swearing in church for many of you. But I've put this substance in my W221 S350 2007 mod .. And it works !!
My engine has gone about 60000 miles. And I have constantly used Mobil1 0W-40 oil as recommended. Have changed oil every 5-6000 miles. Twice as often as type recommended.
The reason I chose to try this substance was that I constantly heard a weak knocking from the engine when idling. I could also feel a slight vibration in the steering wheel. And because I know that newer oils do not have the same quality of additive as before. Due to strict emission rules.
The car had gone about 4-5,000 miles on the oil before I tried Prolong. So that I could tap it out and replace immediately if I felt it was worse.
But the experience was absolutely incredible. Engine runs completely silent now, and the weak vibration in the steering wheel is completely gone.
What do oil gurus think about this substance? Do you have any opinions about any damage it can do to the engine?
This is a Norwegian product, and maybe not the same as sold in the United States. But I think it is related, since it has the same name.
http://www.prolong.no/content/bensin
http://prolong.com/a_et.html

 

For some reason I expected this post to come from a member with zero or close to zero posts...

Please do not mix anything in your oil. And change it as required unless you track your car every weekend.

 

Hi Castro,

Per the Mercedes Manual regarding oil additives...Please read!

 

Yes, I know that Mercedes do not recommend any kind of additive in the engine oil. But my local MB dealer also tells me that oil 229.51 is a higher quality than 229.5. Because that's how it works, higher number better spec. So should I trust MB?
And believe me, I have read hundreds of pages about motors and oil. And totally renovated several old Ford Mustang engines. And never used any kind of "snake oil".
But Prolong, which I used here, I have used several times in my job as an engineer in the North Sea for ConocoPhillips. It actually has an amazing quality as Extreme Pressure lubrication. I have certainly tried nearly 20 different lubricants during assembly of stainless steel components. No one was good, and several times was almost as welding components together. A mechanic colleague came with this Prolong and it has been a dream to assemble stainless steel products afterwards. Have used this in slide bearing and on conventional bearings, and it becomes like new.
One of the belt tension wheels on the engine started making a terrible sound for about a year ago. I flipped one seal on the ball bearing side, and dropped a few drops Prolong. Over a year later I still have the new wheel lying on the shelf in the garage.
I have not fallen for any form of advertising, I've had a pint Prolong in the garage for over 10 years, and spent a few drops at things I want to slide easily.
Behind the bottle it says that this can be used in engine and manual transmissions.
I therefore took a phone to the supplier, and they guaranteed that the engine would not take damage. So therefore I put it in the engine. I know well how an engine is built up, so it will not take damage in the short term. My point is if someone really heard of engines actually have crashed by the use of Prolong?
I do not want to come with claims such as that you get more powers, mpg and extends engine mileage. but that knocking sound and vibration disappeared, is a fact.

 

Since your vehicle is a diesel S350, 229.51 is the proper spec and 229.5 should not be used.

229.51 is specifically formulated for diesel engines vs 229.5 for non-diesels. 229.51 is NOT higher quality, it is a different formulation compatible with diesel engines but is not compatible with ethanol which is commonly added to gasoline.

See http://bevo.mercedes-benz.com/d/d/en/Spec_219_0.pdf for info about oil additives

See http://bevo.mercedes-benz.com/d/d/en/Spec_223_2.pdf for info about oil spec for your vehicle.

 

My car is not a diesel. It is Petrol. Did you really get the feeling that I did not understand what the difference between 229.5 and 229.51 was?
I`m trying to explain that I actually know more about oil and engines than what average. That's why I was a little surprised by the outcome of Prolong. What I wonder, is what damage the engine can actually get. And if anyone has knowledge of whether it actually has damaged some engines.

 

I say send a sample off to an oil analysis lab. That way you will know if anything is wearing abnormally. I wonder if it maybe seals compression rings better but your guess is as good as mine

 

lol...

ever seen a major car manufacturer or oil manufacturer to require use of prolong or any other snake oil? "mobil 1 5w40 - now with Prolong!" or... "ford requires use of prolong to maintain factory warranty".

no...

what your additive did was increase your oil weight- now you have prolly closer to 50 weight. hence the quieter engine.

stay tuned for the sludge shortly followed by rust

currently there is not a single separate oil additive that does what it claims to do. especially one containing chlorine...

if you dont beleive me - ask the ftc- the folks that banned slick 50, duralube, etc.

and speaking of the ftc- here is the compliant filed with them:

http://www.ftc.gov/sites/default/fil.../09/pslcmp.htm

 

Looks like alx is right. Its heavy weight oil and it just seals the rings but will sludge. THe MSDS sheet says it contains paraffin distillates. Paraffin wax is heavy and thick.

http://www.ultimatesyntheticoil.com/..._additives.htm

I'd think about getting it out.

 

heres the msds sheet

 

Yeah Castro....heed alx's advice.

Don't add anything/additives to your oil but more oil if required.