Originally Posted by avi1777
Originally Posted by Cujet
M1, 5000 mile OCI's. That engine is sensitive to oil quality and has a number of known issues. All preventable with good maintenance.
more than 100 thousands engine failures due to metal shavings.
There may have been some that failed early on, due to metal contamination. The rest failed due to a highly stressed design, with insufficient bearing area (a nod to fuel economy) and the use of contaminated, thin oils, changed infrequently. It's no surprise that the rod bearing and timing chains go out simultaneously, due to wear. NOTE: a 30 viscosity oil is best for chains.
The solution is the same as always, choose a quality oil and change it at the severe service interval.