UOA - Mobil 1 0W-40, 2000 C230 kompressor Benz, 4950 miles on oil

[Motorbike]

Look at the wear rates of the 0/40 up top here .

They speak for theirselves do they not ? If not , what am I missing ?

If a oil thickens 2 full cSt's , is that not 1 more than the 0/40 thinned while giving excellent wear protection and better fuel mileage ?

Why do you think that Patman thinks the 5500 mile extension of the interval is too conservative ?

 

[jason07-1zzfe]

It thinned more than 2 cSt.

If wear is still good, all it shows is 40wt was not needed. If the user likes M1, I would just use the 10w-30 in this case.

 

[Motorbike]

Originally posted by Jason Troxell:
It thinned more than 2 cSt.


[/QUOTE

Your correct

but missing another couple of points . What wt oil does that MB call for ?

Exactly why would one want to run a lighter oil in this engine ? It was not ran at a 30wt like you suppose it did all those miles .It protected as a 40wt for awhile .

I'm coming to the conclusion his factory fill oil for some very expensive cars should just be canned because the jaded views of this forum thinks it not capable even though the analysis numbers up top is right there !

How could anyone want better results at those miles ? The owners happy !

Next it will be posted the oil will sludge I suppose . A pre-emptive post then.... show me a sludged 0/40 motor !

The same thing is going on over in another section , a few owners posted they used and really like a dino oil , the a couple jumped in and slighted them .

Why can't a great oil analysis get Kudo's even when the owners happy here on this forum ?

Soon , no-one will want to post there M1 30wt analysis's

 

[jason07-1zzfe]

Jaded? I prefer no-spin. Just because a mfr says something, doesn't mean it is optimal. Or optimal in every situation.

 

[buster]

I'll say this, the Amsoil 10w-40 and Mobil 1 0w-40 both have issues. The 10w-40 isn't that good of an oil from what I've seen of it and neither is the Mobil 1 0w-40. I'd use TSO 20w-50 or M1 15w-50 in this car and skip the 40wt. Or use Delvac 1.

 

[Sin City]

Quote from Erion:

quote:

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You're both looking at the data wrong.

"Grades" don't matter 'cuz they're arbitrary points along a wide-ranging scale. Percentage of original viscosity, relative to the aspiration configuration of the engine, is what you want to know.

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To put it another way Mobil 1 0W-40 thinned out by about 17% in this application. That is significant however some of the thinning is from fuel dilution so overall I can't say that is really a bad performance. The wear numbers do look very good.

I agree with TooSlick that this oil should be good until about 7,500 miles in this application.

[ December 18, 2003, 06:55 PM: Message edited by: Sin City ]

 

[TR3-2001SE]

I think this is a super report! You can definitely go 7500 on this engine/oil combo. Wish I could even come close to this analysis.

I guess this is a combo of an excellent oil in an excellent engine.

 

[Cary]

I agree with Motorbike, the wear numbers are great. While many say that oil manufactures are paying manufactures to use their oil and that the manufactures are not concerned with long life of their cars, I disagree. Mercedes, BMW, and Porsche have built their reputation on the perforance and the long term value of their vehicles, I would not expect them to compromise these hard earned reputations for saving $10.00 for the oil to fill their vehicles from the Factory. Mercedes AMG, Porsche, and Austin Martin all use 0w-40 Mobil 1, this in cars that cost from $50,000 to $500,000 (Porsche Carrera and Mercedes SLR). As far as BMW, we question the use of the Castrol Group III synth, expecially for the interval specified, but the wear numbers have shown that the oil does make the interval (barely and is fully used up at the point).

I have said it before and will say it again, I think we are way overly concerned with minute differences in wear numbers. I also think that we are to convervative with our change intervals. Shouldn't we be trying to run the oil to right before the point where wear spikes? Look at the rare cars we have seen here that have run mineral to 10,000+ miles (in reality not that unusual in the real world), and synths to 20,000+ with moderate, but not excessive wear numbers.

Cary

 

[TooSlick]

ANY 0w-40 or 5w-50 oil will shear in a high performance, DOHC engine, it's not something that's limited to Mobil 1. I'm sure if I took the Amsoil 0w-40, with a boosted VI of 204, and ran it in my Audi TT turbo I could get it to shear down about the same amount. I may do that some day, just to show this is a general problem with 0w-40 formulations and is not limited to Mobil 1. The Mobil 1, 0w-40 actually does better than most 0w-40's I've seen with regards to shear stability.

My opinion is that 0w-40 and 5w-50 oils are a bad idea in general. The "one size fits all" message seems is appealing if you don't know what you are buying. However, if you live in an area with large temp fluctuations, you would be better off running a 0w-30/5w-30 in the winter and a 15w-50 or 20w-50 in the summer, as opposed to a 5w-50. The 0w-30/5w-30 will flow better during warmup and provide better fuel efficiency once you reach normal operating temps. The 15w-50 or 20w-50 will provide a thicker oil film and reduced oil consumption. There is only so much you can stretch a given basestock, and a 35 pt spread, ie a 5w-40 or 15w-50, it really about it with current basestock techology

The second reason why 0w-40/5w-50 grades are a bad idea has to do with what happens to excessive VI improvers as they degrade from shearing and heat/oxidation. These degraded polymers lead directly to sludge/varnish and carbon deposits, particularly in the upper ring grooves and on the piston skirts. This has been well documented in several SAE papers I've read - I'll be glad to provide references if you wish to download them off the SAE website....

For the same price, the Mobil 1, 5w-30/10w-30 are much more shear stable formulations than their 0w-40. The 10w-30 - with a HT/HS of 3.3 Cp - is paricularly good and is the Mobil 1 formulation I'd run in this motor.

 

[buster]

quote:

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I have said it before and will say it again, I think we are way overly concerned with minute differences in wear numbers

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Cary, this is the absolute truth. Couldn't agree more. Unless we are seeing, lets say, 60ppm of Pb vs 5ppm in the same engine, same interval etc. then most of this stuff is irrelevant, period. Keep the engine clean and you'll be set for a long healthy engine.


Too add to this, Tooslick is right, a "one size fits all" isn't the best idea. Covering a 40wt spread is huge. Any 0w-40 will shear. The eurpeaon Mobil 5w-50 will shear too. It's just not your best choice. Right now, the 0w-30's are the limit I'd go with Amsoil and GC being the only one's I'd use, unitl M1 0w-30 R is out.

[ December 18, 2003, 07:25 PM: Message edited by: buster ]

 

[sprintman]

And way too concerned about viscosity as well, almost to the point of it being a phobia. Last weekend I changed to a 5W40 and I know a few here would 'have kittens' if I suggested doing that in their 10W30 CAFE motor.

 

[JetForeman]

geeeeez guys, I didn't mean to start wars here. But I have to admit you all provide some excellent reading

 

[Ken4]

One more question, what is your time duration on this oil?

 

[JetForeman]

8/30 to 12/12, almost 3 and a half months

 

[JetForeman]

would anyone like me to post the ATF sample report that I had done on the same car or is that something that's not generally looked at here?

 

[Patman]

quote:

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Originally posted by JetForeman:
would anyone like me to post the ATF sample report that I had done on the same car or is that something that's not generally looked at here?

---

For sure, post it! There have been a few ATF reports posted here, but not many. Most of us don't quite know how to interpret what they mean, but with enough reports posted, we'll learn.

 

[joee12]

Who cares about the oil shearing down, the only thing that matters in a UOA is wear metals or contaminates. Even Ted, who sells a competing product, says that it can go 7500 miles. This is another excellent UOA that gets a bad rap because it is a Mobil 1 UOA

. -Joe

[ December 20, 2003, 10:02 AM: Message edited by: joee12 ]

 

[sbc350gearhead]

Joee.....I merely pointed out the fact that it sheared down. I did not say anything beyond that. I defend RP regularly, and RP allways seems to shear down, regardless of viscosity.......I am not sure that RP's straight weights are stable.

I think mobil 1 is a very good oil, and I would like to see more UOA's on the 0w40.

 

[TooSlick]

The Mobil 1, 0w-40 is an excellent oil ...but I like their 10w-30 even better and I think it will keep the engine cleaner over the long term. Shear stability is more important than initial viscosity, particularly for drains > 7500 miles.

Is that simple enough?

 

[buster]

I don't thin M1 0w-40 is excellent at all. I think it should be more shear stable. My 2 cents.