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  #1  
Old 04-18-2015, 06:43 PM
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oil analysis puzzle

I have just received the second oil analysis on my '97 E 300 D, using two different oils, and both have high chromium with other metals about normal. This oil analysis was on M1 TDT 5W40. The previous analysis shown was using Rotella T6 5W40. I am curious to know if anyone with this engine has had their oil analyzed, and if so, I would be interested in your level of chromium. I have Delo 400 synthetic 5W40 in it now so I will see how it does, but I am kind of sorry I analyzed the oil. Now I worry about the rings being chewed up, but I have no intention to tear into a well running engine.
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  #2  
Old 04-19-2015, 12:50 AM
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Oil analysis?

Don't forget to analyze your brand of oil before you add it to your engine.

Just a thought.

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  #3  
Old 04-19-2015, 01:02 AM
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oil analysis puzzle

What's up with molybdenum in regard to oil? The drop seems significant. Is that just the oil types?

It's what plants crave...

Isn't the crank chromed? I'm such an amateur...
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  #4  
Old 04-19-2015, 01:21 AM
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Quote:
Originally Posted by Lucas View Post
It's what plants crave...
Wait, your oil had Brawndo in it?
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  #5  
Old 04-19-2015, 01:22 AM
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The chromium is part of the wear metals like the rod and main bearings yes the crank is polished but not sure if it is chromed
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  #6  
Old 04-19-2015, 01:42 AM
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So you have a bunch of knuckleheads. I'm sure someone else that does this will come along. Personally I think it's super cool. May have to look into it with my new car. Curious if it is expensive to get done. Ill check it out. Got awhile. Maybe I'll make a new thread to learn. We do lab tests with plants to watch stuff like our nitrate levels. Gotta hit the magic number.

To just pull stuff out of my a**, I would look at the wear parts and composition. Whatever has the highest percentage of chromium seems like the ticket. Like if the rings are 60%, but the crank and rod bearings are 90%, I would assume there. As your other wear metals seem normal, they say.

I had a crank below minimum, and a well trusted knowledgable guy talked about having it "re chromed." I believe the cam also. Excuse my ignorance but does this motor have hydraulic lifters? Maybe take a look to make sure they aren't freezing up or not rotating and dishing on the top. If it had hydraulic the mileage is perfect for a dirty clogged up lifter. Totally easy to clean, if you have a spare 15 hours

What are he other wear metals in the sample?

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  #7  
Old 04-19-2015, 02:03 AM
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^^^ How much do they pay you to say that?
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Garage:

2017 Chevy Colorado Diesel (nanny state emissions)
2005 Volvo S40 T5 AWD, 77k
1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg
1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg

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Old 04-19-2015, 02:54 AM
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Big money. Everyone knows that. Pppffftttt.
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  #9  
Old 04-19-2015, 03:43 AM
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Moly is from MoS2 which is an antiwear additive.

All I can say is, also consider the injection pump and turbo since they are also within the oil path. I wonder if there is any Chrome within the turbo bearings. Chrome could come from the piston rings, but it's a great point that the cylinder wall and probably piston skirt would be wearing in addition.

I don't know what exactly is Chrome plated or a Chrome alloy within a 606.
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Old 04-19-2015, 04:45 AM
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So what does that say about mobile 1? With less Moly and more wear some wear? Are my speculations drawn from ignorance correct? I hope someone answers OP's request. In fact, there should be an entire thread.
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  #11  
Old 04-19-2015, 04:53 AM
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Have you asked over at BITOG?
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Garage:

2017 Chevy Colorado Diesel (nanny state emissions)
2005 Volvo S40 T5 AWD, 77k
1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg
1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg

WARNING: this post may contain dangerous free thinking.
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  #12  
Old 04-19-2015, 05:55 AM
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The bearings shouldn't have any chrome, that would be your lead and tin, and perhaps bronze/brass and the steel shell. I kinda doubt the crank/cams are chromed in any way, I have a 606 apart right now, I see no traces. If anything the crank may be nitrided and the cams are ductile iron. Where I think chrome could be from, possibly the rings, very possibly the lifters. In an engine hard chromium plating can be used on high wear parts. Could be from the timing chain or the turbo also, perhaps the injection pump? Also worth a thought, chromium could be leached from stainless steels, perhaps there are acids in the oil or some electrolysis pulling chromium from something stainless. Over all, if its running fine, I wouldn't be too concerned.
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Old 04-19-2015, 06:07 AM
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The only parts I'm aware of in an engine that would be chromed would be the piston rings (as mentioned before)
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  #14  
Old 04-19-2015, 11:20 AM
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I have to go along with Stretch. Piston Rings on larger Diesel Engines have Hard Chrome on them. But, I don't know that applies to Mercedes.

But, chrome is also alloyed in Steel so unnamed other Parts could have chrome but then you would think that Iron would also be high.

As mentioned parts are sometimes Hard Chromed.

The Company that did the Oil Analysis might have extensive knowlege on where the Chrome might be coming from.
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  #15  
Old 04-19-2015, 12:54 PM
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Quote:
Originally Posted by nelbur View Post
I have just received the second oil analysis on my '97 E 300 D, using two different oils, and both have high chromium with other metals about normal. This oil analysis was on M1 TDT 5W40. The previous analysis shown was using Rotella T6 5W40. I am curious to know if anyone with this engine has had their oil analyzed, and if so, I would be interested in your level of chromium. I have Delo 400 synthetic 5W40 in it now so I will see how it does, but I am kind of sorry I analyzed the oil. Now I worry about the rings being chewed up, but I have no intention to tear into a well running engine.
Attachment 128836
Much to do about nothing.

1) Did you analyze the new oil as a control?
2) What make you think chromium level is bad? what is chromium btw? Why is it bad?
3) What is your expectation on chromium level, on your engine or in any OM60x engine in general?
4) What make you think it will shorten the engine life?

You have no basis to worry IMO. Just toss the report, have a beer and relax.

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