Bolts recommendations
I recommend that you use Genuine BMW bolts.
The updated M10x1.25mm rod bolts (SKU: 11247834310) need to be replaced as they are stretch to yield.
BMW once (or twice) recalled bearings - AH!
First it was the oil pump, then the bearings. Atleast they cared back then!
As part of my Special Series on bulletproofing the S54, this entry touches on the recall's history and bolt nuances.
We button up the S54's bulletproofing by replacing the rod bearings with the ACL bearings.
Enjoy,
- Matt / @m3_epoustouflant
Been there, done that.
ACL is recognized as a premier brand throughout the motorsports world and engine builders.
Their coated bearings combine ACL’s tough RACE Series lining and overlay metallurgy with Calico’s CT-1 coating.
CT-1 is a Dry Film Lubricant coating that helps reduce friction and abrasive wear. It provides intermittent dry lubrication and is not affected by dust or dirt.
It's what I run in my M engines.