Is it me or has MB Change their Motor Oil recomendation again or I am just not follwoing up with the times.

Back in 2000 MB said dino was o.k. And they changed it to full synthetic. And back then they said 10-30, 10-40 full synthetic was o.k. under most temperture ranges.

And now apparently 10-30 and 10-40 is not o.k. you need a 0-40 or 5-40 and only certain brands (for example only 0-40w Moble 1 is o.k. and 5-40 Moble 1 is no o.k.).

As a mechanical engineering who have not look at the reason and the test data behind the MB recomendations. Do it really make that much of a difference unless you are say below zero F?

Take it from honda. My 2006 accord only recomends 5-20 for all temperature ranges. And the 92 accord with 215k miles only recommends 5-30 (I believe did not look it up) again for all temperature and did not ever change their oil recommendstion.

blau

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Silver Honda Accord, 2006
Silver G500, 2003
Silver SLK-320, 2002
Black ML-320, 2000
Bule Porsche 993 Targa , 1997
Silver Merkur XR4Ti, 1987

Pull out your owner's manual, and follow it's recommendations.

As they come out with new engines, it stands to reason that they might change the fluid specifications. That doesn't mean that it is retro-active to previous years.

So Mobil Oil comes out with Mobil 1 0-40. This oil pretty much works from the coldest climate to the hottest climate. Mercedes signs a contract to use Mobil 1 as factory fill and recommend it at all dealerships. This is a big contract and a win-win for both sides. Sure doesn't mean other oils won't meet the Mercedes specification.

Steve

It's more about meeting a comprehensive quality standard, 229.5, for example, which addresses many more attributes than just ambient temp and viscosity.

Few seem to realize that when you purchase an oil meeting the mfr's spec, you really don't have any other concerns about it being the "right oil" or not. The API specs, as a default, are far too broad. So, for many mfrs today, you either use their specified quality standard or you don't have an engine warranty. It's pretty simple.

I hope that makes sense.

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1998 W210 diesel (wiped out by a texter)
Baum spring compressor "for rent"

Latest list of Mercedes approved engine oils http://www.whnet.com/4x4/oil.html

Just so you guy/gal know.

According to my calculation based on the viscosity data supplied by http://www.mobil1.com/USA-English/MotorOil/Oils/Mobil_1.aspx.

At temperature above -10 deg celcious (14 F). 5w-30, 0w-30 and for sure 0w-40 is a thicker oil then 10w-30. Only if you go below this temperature when the 5w and 10w will be thinner that the 10w-30 oil. Feel free to comment if I did my math wrong.

So if you want a thinner oil at starting and you are not in an area below -10 deg C (14F) 10-30 is thinner oil.

All viscosity for the xxW-30 oil are about the same at 100 deg C (max engin temp).

So the MB engineers may have made a recomendation based on ALL possible tempeature conditions, not the best for YOUR temperature condition. (like I said I did not see their test data and the reason for their conclusions).


P.S. a comprehensive quality standard could include thing like book keeping, or employee safty standards ect (all sorts of things). So if a company does not comply in these areas they don't meet this standard and may have nothing with the quality of their product.

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Silver Honda Accord, 2006
Silver G500, 2003
Silver SLK-320, 2002
Black ML-320, 2000
Bule Porsche 993 Targa , 1997
Silver Merkur XR4Ti, 1987

What in the world are you trying to communicate?

Why try to re-invent the wheel ? Use one of the recommended oils and relax.

Sheesh!

Steve

I am communicate this.

So the MB engineers may have made a recomendation based on ALL possible tempeature conditions, not the best for YOUR temperature condition.

it is that simple.

__________________
Silver Honda Accord, 2006
Silver G500, 2003
Silver SLK-320, 2002
Black ML-320, 2000
Bule Porsche 993 Targa , 1997
Silver Merkur XR4Ti, 1987

They specify min and max HT/HS. Spec-ing a "5W-30" oil leaves a lot of latitude, too much for some engine designers.

You can refer to Pg 6 of the contemporary product recommendation guide:

http://www.theworkshopmb.com/TheWorkshopMB_MBZ_FactoryApprovedServiceProducts.pdf

__________________
1998 W210 diesel (wiped out by a texter)
Baum spring compressor "for rent"