I am just rebuilding it as preventative maintenance. After 360K, I sure don't want it to drop a ball bearing and toast the timing chain/engine.

Is it safe to say that an MRC ABEC-1 is about the same quality that MB used in the original bearing?

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1984 300D 398K-daily driver
1998 Honda Accord 102K -wife's daily driver
1991 Volvo 740 289K
2000 Toyota Corolla 143K