Automotive BMW ROD Bearing problems

[petrolhead47]

TL;DR Summary

BMW Engine and their problems

Hi i Have a question about bmw's engine. Everyone knows thats engine this company have a rod bearings problem. But nobody excatly know why is that? In Web we can search lot of reason.
1. Bad oil and too rarely change. BMW recommend 10W60 and perhaps it is a thick oil and when it's cold start the bearing runs without lubrication.
2. There are tight engine tolerance between the shaft journal and the bearing, But in my opinion there isn't a true because 10W60 for tight tolerance ?
3. Lot of things that crankshaft are crooked.
So i don't know what is the problem ? You are a mechanical engiinering and maybe knows answer ? how avoid problem or

how to service such an engine?

 

[sbrothy]

I’m not an expert but it looks like you pretty much answered your own question:

Frequent and regular oil changes. Avoid subpar oil.

Avoid too high pressure, load and beware metal fatigue.

Perhaps better quality bearings?

 

[sbrothy]

Lots of suggestions out there…

 

[Baluncore]

Maybe you are referring to the S65 engine (E90/E92/E93 M3), S85 engine (E60 M5, E63 M6), and S54 engine (E46 M3), which are prone to rod bearing problems. Which engine do you have?

Always warm the engine before working it hard.

Use oil of the recommended grade.
Change the engine oil regularly, more often than recommended.

Do not wait for a mechanical failure, replace the bearings on a regular basis.

 

[petrolhead47]

Być może masz na myśli silnik S65 (E90/E92/E93 M3), silnik S85 (E60 M5, E63 M6) i silnik S54 (E46 M3), które są podatne na problemy z panewkami korbowymi. Który silnik posiadasz?

Zawsze rozgrzewaj silnik przed ciężką pracą.

Stosuj olej o zalecanej klasie.
Wymieniaj olej silnikowy regularnie, częściej niż jest to zalecane.

Nie czekaj na awarię mechaniczną, wymieniaj łożyska regularnie.

BMW's engine specially MPower have a rod bearing problems. For example S54, S65,S85.S55 etc. In the internet can read about suggestion which i include in my first post but neither suggestion is confirmed for sure. So that's why i insert my post here because there are lots of people who like mechanical engineering or maybe deisgn a combustion engine and help me solved my question. Maybe there are a people who analys the bmw's engine ?