For clarity's sake, don't forget that Jim's conversation was about RMS issues, not failed engines. The 20-25% number includes cars that just had to have the rear main seal replaced, not the entire engine.
How many of those will leak again? Unknown.
How many of those were, or will be out of spec and need a replacement? Unknown.
It's obviously not every one, but some small percentage of that 1 in 4.
Point is, 25% do
not have to have an engine replacement, at least not from any poll, measurement or hearsay anyone can point us to.
Here's to being in the 75%!!