Actually you're quite right, the rod bearing recall does indeed specify 1200 miles, I'm not sure where I'm imagining I read what I said, but I definitely can't find itMangozac wrote: ↑Wed Nov 29, 2017 4:40 amBy BMW's workshop manual you're referring to TIS/ISTA? I couldn't find any reference to it and unless it specifically says that a run-in period isn't required I wouldn't take it to mean that it isn't.
I know the arguments which say that the break-in is unnecessary, but it is recommended by BMW: under SIB 11 04 04 (rod bearing updates for early E46 M3s) it specifically states that a 1200 mile break-in period is required following the correction work. I have two friends who are experienced BMW techs, both E46 M3 owners and they agree that a break-in should be performed.
That said, I do agree that 1200 miles of break-in is certainly overkill but dyno runs are not a casual engine operation so I definitely wouldn't be doing one too soon after the bearing change!
That said, the bearings in theory should not need running in, but I agree with you that a dyno session so close on from replacement is not a great idea. Maybe 1K miles has already been put on