i want to switch to a baffled oil pan like the one from JUN(buscher has a oem looking one too but those yanks dont want money apperantly)
i might aswel do the rod bearings(oem bearings dont need anything fancy) while im doing that job so is it possible to do?

 

Yes but i wouldn't suggest it. What makes you want to change them in the first place?

 

car has done 179653km all of them driven hard and why not when im already there

 

Replacement of rod bearings on the 4g63 is a repair not a maintenance item. Installing new ones could actually introduce issues instead of preventing them. I'd save yourself the time and money. One has to pay attention to the clearances of the rod journals, rod bore, bearing crush, and rod bolt stretch to do it right.

I know that they became a maintenance item on the 10 cylinder BMW M5 due to a design flaw (improper factory clearance)

If the engine is running fine without any signs of metal shavings (or rod knock), there is no need to replace those bearings.

 

^ Agree wholeheartedly. At 116k miles with 11 track events, my bearings were all still in perfect shape.

If you have good reason to suspect a problem, i'd start with some non invasive testing:
1) Used oil analysis
2) Oil filter autopsy

 

The OEM bearings have 3 or 4 different sizes. You would have to take your bearings out to see what you have and order replacements.

But like others have said, it is an unnecessary repair that could actually cause an issue where there isn't one.

 

Agreed with the above. The 4G63 has proper bearing clearance and oiling, so they are not a routine maintenance item. If you rebuild the whole engine or spin one, sure, but high mileage is not going to guarantee that you need replacements. Essentially they’re fine until they fail in a big way, and you can’t prepare for that. You hear about precautionary bearing replacement on stuff like BMW’s M E46/E92 M3 engines and V10 M5 engines because the clearance was tighter than it should have been, so premature wear is absolutely a concern there. If you’re really concerned, drop a rod cap and inspect one, but I doubt you’ll see anything catastrophic.