Need engine builders help, S54 build going terrible wrong.

[SteelGreyM]

Perhaps you got some glazing...

Ive tried to read as many sources as i can find to get the consistent recommendations at several steps of this build. Hope you get it sorted.

https://www.jepistons.com/blog/how-to-break-in-an-engine

How is it recommended that you break in a rebuilt s54?

I couldn’t find a 10w-60 break in oil.

The best thing I found was a 15w-50 break in oil.

Should I use that or 10w-60 to break it in? Should I drive it hard? Easy? Or BMW break in procedure?

[Slideways]

How is it recommended that you break in a rebuilt s54?

I couldn’t find a 10w-60 break in oil.

The best thing I found was a 15w-50 break in oil.

Should I use that or 10w-60 to break it in? Should I drive it hard? Easy? Or BMW break in procedure?

According to the first post in this thread, there is no special break in oil from factory - https://www.pistonheads.com/gassing/topic.asp?t=1658937

BMW break in procedure, then change oil at 1200 miles. If it worked to get a factory built motor to 150k+ miles and burning almost no oil, it should be good enough for a rebuild.