2024 AMG oil

kschachn said:
The plot thickens. No record of anything, huh?
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Not sure what you are implying with that, but no, no detailed work order as, like I said, the car was still on the rack when I took delivery of the new, replacement vehicle. I'm sure there is record of it in my account files at the dealership if I desire. I have had 5 mercedes benz cars with them and afaik they still have everything on file.

They sent the motor back to Germany for analysis. I would love to know the outcome. Unfortunately they kept the local MB rep insulated from me and I am not able to reach out to him to inquire.
 
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Super reliable Hot Turbo V8 - the 7.3L Powerstroke Diesel. :ROFLMAO: Not exactly the same class as a MB though.

OP - did you get to look at the oil they drained out? What's the warranty on the replacement car? And does the dealership have written documentation that the replacement car was knocking too? Sorry for the barrage of questions but I think we all hope you don't get stuck with a $100k paperweight.
 
Here is pic of the replacement motor that went in my old car. Fairly impressive in person.

New Motor.webp
 
Seems you have a very good relationship with the dealership! They allow you to take pictures etc. No one mentioned an opinion on the failure?
 
crashz said:
Super reliable Hot Turbo V8 - the 7.3L Powerstroke Diesel. :ROFLMAO: Not exactly the same class as a MB though.

OP - did you get to look at the oil they drained out? What's the warranty on the replacement car? And does the dealership have written documentation that the replacement car was knocking too? Sorry for the barrage of questions but I think we all hope you don't get stuck with a $100k paperweight.
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For clarity....

The replacement car has 6k miles on it now. I just had it at the dealership for an "A Service" (oil change). I did let them know that I am starting to hear the same knock in this car. They said they listened, but could not hear. It was most likely cold which is why they didn't hear, because it is fairly obvious if the car is at temp and you listen; especially when they know exactly what they are listening for (my last car).

I wanted to wait until I had this oil change to see if the knock was still there before I moved forward with anything. So far, the knock is not there, but I have had only 30 miles on the new oil and I listened only once. More to follow with that.
 
Glenda W. said:
Seems you have a very good relationship with the dealership! They allow you to take pictures etc. No one mentioned an opinion on the failure?
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yes, the master mechanic who worked on it said main bearing knock. but afaik did not put it all back together to gap the mains. I would also love to know if they noted the oil pressure at idle and warm. They are not the largest (best) dealership for all of this, but I have had a long relationship with them and felt obligated to stick with them.
 
Glenda W. said:
Seems you have a very good relationship with the dealership! They allow you to take pictures etc. No one mentioned an opinion on the failure?
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also note... it was only a knock at that point, not "failure" at that point.
 
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Scott Baer said:
yes, the master mechanic who worked on it said main bearing knock. but afaik did not put it all back together to gap the mains. I would also love to know if they noted the oil pressure at idle and warm. They are not the largest (best) dealership for all of this, but I have had a long relationship with them and felt obligated to stick with them.
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It does appear one of the main bearings has uneven wear. Although I’ve seen this on other engines on the outer accessory drive side bearing. The rod bearings appear to have had some debris run through them. I wonder if they measured the crankshaft bore alignment?
 
edyvw said:
Maybe now you “hear” things bcs. well, paranoia. I mean, I would be paranoid too.
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I totally understand your point. I promise, it is (was) there. if it comes back, Ill post video of the sound.

I very much appreciate all of your professional input. I built several motors in my younger years and can relate/understand to (most of) your technical comments.
 
Being that this IS an OIL forum, can anyone opine to the following... Can oil breakdown over time (6,000 miles) and become too "thin" to effectively create the liquid cushion required at the main bearings? in this case, it seems, only at idle...
 
Scott Baer said:
Being that this IS an OIL forum, can anyone opine to the following... Can oil breakdown over time (6,000 miles) and become too "thin" to effectively create the liquid cushion required at the main bearings? in this case, it seems, only at idle...
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You may have a reason as why not to send it to Blackstone they won't measure fuel dilution properly if it exists and maybe lowering viscosity.
 
Scott Baer said:
Being that this IS an OIL forum, can anyone opine to the following... Can oil breakdown over time (6,000 miles) and become too "thin" to effectively create the liquid cushion required at the main bearings? in this case, it seems, only at idle...
Click to expand...
Sure. Either due to engine design which causes excessive shear forces on the oil and degrades the VII. Things like gear driven camshafts. Or through excessive fuel dilution. As noted above use a lab that measures fuel directly such as via gas chromatography. Blackstone is useless at this.

However, Mercedes-Benz has a stay-in-grade requirement as part of the approval. So on the face of it a viscosity related failure should not happen unless there is a mechanical defect.
 
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