R129 engine oil - which one please?

[Gazwould]

Oh yes it is , oil basestocks and additive package is what gives and dictates it's quality thus different oil performance perameters .

No need to over complicate it , higher quality IS better .

Were not talking about correct coefficients of gearbox oil .

 

[Gillsl500]

Which is fine if you understand what you are looking at, and its relevance to the situation at hand.

When Mercedes update their 229 listings, it's based around the requirements and standards of the current engines in their lineup. This means both the standards and viscosity change to meet those requirements.

Retrospectively applying those changes across the board to engines designed and built with previous specifications in mind doesn't necessarily work in the way you appear to be implying it does. More is not automatically better.

All im saying is...Doodle is one seriouse geezer ...

Thanks so much for all the info lads. Will post an update for when I know whatever we're going to do

 

[Doodle]

Oh yes it is , oil basestocks and additive package is what gives and dictates it's quality thus different oil performance perameters .

No need to over complicate it , higher quality IS better .

Were not talking about correct coefficients of gearbox oil .

Or indeed over simplify it, as you are. Higher quality is undoubtedly better, providing the application will allow for it. But "quality" and "viscosity" are two very different parameters, that are not necessarily directly linked and for very good reason.

 

[Gazwould]

That's right a 30 grade can out perform a 40 grade , etc .

 

[Doodle]

I would suggest you read this then.

What Happens if I Use the Wrong Weight (Viscosity) of Oil? - AMSOIL Blog

 

[Gazwould]

What are you trying to say ?

 

[Doodle]

So you read and digested the entire article in 3 minutes then?

 

[Gazwould]

I know already , what's your problem ?

 

[markjay]

Use a 5W40 by all means but an updated one will give you better oil performance perameters .

If I understand correctly, what you meant to say was that 5W40 is fine, but with regards the 229.3 spec he would be better-off using newer spec e.g. 229.5/229.51/229.52, is this correct?

 

[Gazwould]

Yes that is correct MJ .

229.3 is an old spec with poorer oil performance perameters .

It's old handbook frozen in time when now there is much better offerings that weren't available at the time , but people get scared and confused to use anything outside of the frozen handbook. .

 

[Doodle]

If I understand correctly, what you meant to say was that 5W40 is fine, but with regards the 229.3 spec he would be better-off using newer spec e.g. 229.5/229.51/229.52, is this correct?

Being a list frozen in time works both ways. 5w40 doesn't even appear in the .52 list.

Gazwould, to remove any ambiguity, are you implying that lower viscosity is always better, because it is that message that I have issue over?

 

[Gazwould]

No not always better .

But between the two can be just 0.5 centiStoke depending on info on data sheet with a maximum of 8 possible .

Like I've said a few times my own preferred one stop shop is 5W30 VW 504.00 507.00 because .

Superior anti wear because it protects the narrow camshaft lobes of VAG PD engines .

Gets this from higher concentration additive package and group 4 and 5 basestocks , thus reducing ZDDP to make it a low saps .
Although low saps it exceeds most group 3 based oils 'synthetic' but severely hydro cracked mineral oil .

Both petrol and diesel including most Audi S and RS models .

And LongLife so more detergents and dispersants - polar heads with hydrocarbon tails !

Is a thick 30 grade , a gnats whisker from a 40.


So I wouldn't have a problem using it in most petrol or diesel , dpf / non dpf requiring a 30 or 40 grade .

 

[BlackC55]

Thanks so much for the info chaps. Spoke to a r129 specialist today and he recommended I use a 5w40 229.3 spec synthetic oil for my m119 engine??

He said he wouldnt know if this would solve the ticking problem, how ever said that this is the correct oil spec for the car?

What do you guys feel?

You have a 113 engine.

 

[Doodle]

Then with that elaboration, we're all good