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#1
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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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'97 E 300 D |
#2
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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. snapped_bolt
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'81 240D For now, a good place to borrow new parts '80 300TD Probably will be put back into service! '79 240D BACK IN SERVICE SINCE 09/16; limited use, oil leak. Guide pin r/sealed/replaced. Still a leak. Front crank seal.... |
#3
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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... |
#4
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RenaissanceMan Labs: where the future is being made today. 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. |
#5
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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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'85 F250 6.9L diesel 2wd XL XC LB Centurion, Gone '95 Mercedes E 300 Diesel W124.131 with a OM606.910 and just over 200k on the clock, needs top end engine work and a transmission. 2000 S500 W220 with a 5.0L V8 gas power. |
#6
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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? Brought to you by Carls Jr. |
#7
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^^^ How much do they pay you to say that?
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RenaissanceMan Labs: where the future is being made today. 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. |
#8
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Big money. Everyone knows that. Pppffftttt.
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#9
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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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'84 190D 2.2 5MT (Red/Palomino) Current car. Love it! '85 190D 2.2 Auto *Cali* (Blue/Blue) *sold* http://badges.fuelly.com/images/sig-us/302601.png http://i959.photobucket.com/albums/a...0/sideview.png |
#10
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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
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Have you asked over at BITOG?
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RenaissanceMan Labs: where the future is being made today. 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. |
#12
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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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87' 300D, Currently undergoing an OM606 swap/build! SUPERTURBO!!! 03' 2500HD Dmax + goodies! 82' 300SD, parting out! 93' 300TE 4matic, parting out! 83' 240D Project Cheap Drive 89' 300E, parting out! 74' Datsun 510 wagon 88' RX7 10thAE, 13B track car build soon Skippy~ As for perception: Drive what you like and can afford. Those who don't like it can supply vacuum to one of your components. LOL If you need parts, I have some! |
#13
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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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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits! |
#14
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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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84 300D, 82 Volvo 244Gl Diesel |
#15
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Quote:
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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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
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