Gazwould
MB Enthusiast
Viscosity doesn't dictate protection .
C63 W204 oil - 5w40?
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Agreed. Though using engine oil with the appropriate viscosity for the conditions is a prerequisite for protection.
Gazwould
MB Enthusiast
I think it's a very old fashioned way of looking at it and engines regulate their temps regardless of ambient .
A sweet spot viscosity grade for general use is 5W30 some of these 30 grades have remarkable film strengths out performing thicker grades .
One of the most harshest environments for engine oil is track days , high engine temps with high EGT's poplar choices in this country is 5W40 Fuchs Titan Race Pro S and 5W40 Millers Nanodrive CFS NT+ , both Ester racing marketed oils .
No need to go thicker anywhere , with thicker oil you get more friction and heat with hot spots as slower flowing !
A sweet spot viscosity grade for general use is 5W30 some of these 30 grades have remarkable film strengths out performing thicker grades .
One of the most harshest environments for engine oil is track days , high engine temps with high EGT's poplar choices in this country is 5W40 Fuchs Titan Race Pro S and 5W40 Millers Nanodrive CFS NT+ , both Ester racing marketed oils .
No need to go thicker anywhere , with thicker oil you get more friction and heat with hot spots as slower flowing !
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The idea isn't to get 'thicker oil' running in the engine... not for healthy engines, anyway.
The idea is for the oil to maintain the correct thickness regardless of other factors (to the extent possible).
So if a 40 wt oil becomes to hot, for example, it will also become too thin to provide adequate protection.
As for the relationship between viscosity and ambient temperature being an old-fashioned way of looking at it... this may be so, though I am not aware that oil manufacturers or standards institutes have updated this table, so please do share any up-to-date information that you may have on the subject.
This is where the graph I posted came from:
Knowledge Centre | Penrite Oil
SAE stands for Society of Automotive Engineers. The SAE developed a numerical classification system to define the viscosity or thickness of oil. The original viscosity grades were all mono-grades, e.g. a typical engine oil was a SAE 30. This was an operating temperature viscosity. Basically, the...
www.penriteoil.com.au
And on a general note... you tend to post graphs and other snippets of information without providing the source. This makes it very difficult to assess the data provided, where there's no context, background, or authors' notes. Unless you happen to have privileged access to copyrighted material, I suggest that in the interest of transparency you post links to the sources of information provided.
I love a good oil debate, and in my experience most dealerships don't have a clue unfortunately.
My question here is. I have just purchased my 507, and prior to purchase, the car had a full going over and service with plugs etc at MB. Now the invoice states - Mobil Super 3000 XE 5W 30. - 229.51. Is that the wrong oil for the W204 C63? Or have the updated/changed at some point ?
TIA
My question here is. I have just purchased my 507, and prior to purchase, the car had a full going over and service with plugs etc at MB. Now the invoice states - Mobil Super 3000 XE 5W 30. - 229.51. Is that the wrong oil for the W204 C63? Or have the updated/changed at some point ?
TIA
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Skd884
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So I best get on the phone to them then!
Steve84N
MB Enthusiast
When you call ask them what oil they used first before saying anything. If they answer correctly it's probably just the desk bod typing in the wrong oil but the right one was used in practice.
I'm now finding mixed info online. Some are saying it's the correct oil. The owners manual is a waste of time in regards to oil!
Steve84N
MB Enthusiast
You can use 0W40. I wouldn't use 30 as it's a bit thin when up to temperature. These engines run hot and need oil to stick on the valvetrain.
229.50 is the specification you need to check for, then either 5W40 or 0W40. Personally, I use 5W as it's a bit thicker when cold which helps stop all the oil draining out of the lifters etc.
229.50 is the specification you need to check for, then either 5W40 or 0W40. Personally, I use 5W as it's a bit thicker when cold which helps stop all the oil draining out of the lifters etc.
Yeah that sounds about right. Thing is, if that oil is spec'd for use with the engine, MB will just say it's within spec and won't do anything about it. I'll give them a call and see what they say.
It's 229.51 they have put in, according to the invoice.
Steve84N
MB Enthusiast
Like I said, there's a good chance the invoice is wrong. On the one hand you've got garage monkey who knows mechanics and on the other you've got secretary monkey who knows copy and paste.
Its 229.5 5w40 in mine since newMB spec id get the 5w 30 out and tell them to use the correct oil there is a guy on here ANTHY i think and on his invoice they put diesel oil in his
Yeah going to call them this afternoon.
Cars going back in on Friday for an oil change. Fair play to MB, I asked if they could confirm the oil that was put in the car. They called me back and told me that the tech has put the wrong oil in, as it should be a 5w 40.
Attention to detail!
Steve84N
MB Enthusiast
Fairly basic detail at that!
You would think so!
