This video was just put out a few days ago showing several S65 engines at different mileages that locked up. They go on to demonstrate how the #1 main bearing puts a high load on the upper bearing causing a cascading bearing failure. The say the double chain has too much tension up front. They are looking into a fix for that but the discovery is too new so no proven solution as of yet.
They do have a fix for the #1 main bearing problem making a custom main bearing bored out to allow for more tolerance but holy shit that’s not for the faint of heart.
Some people in the comments mention what about using 10-40 oil and the the company replied not a bad idea and change every 3k.
My buddy just had his bearings done 30k ago with frequent oil changes and his locked up proving this video to be more truer than ever. He did find someone who can rebuild it for 8k but not sure if that includes removal and installation. A main bearing labor cost is gonna be at half that cost? So preventative main bearing cost could be worth it.
The guys in the video make a good point stating tight tolerance race engines get rebuilt after every race. We’re out here DDing in our race engines pushing are cars to the limit on the street and on track only changing the bearings.
So the question is how much is a main bearing replacement cost?