Ecotec LE-5's are really stout little motors (e.g., with forged internals, oiler jets, all aluminum, etc.), but they do have an Achilles Heel, which is their timing chains. Many motors will go 200K miles, but enough of them have timing chain guide failures around 60-80K miles, that it was prudent to replace the chain and guides. And while the motor was open, we also replaced the water pump, oil pan gasket, and a handful of other seals. We're also resurfacing the flywheel while everything is apart (though the clutch itself looks almost brand new, so we're not replacing it.) Here's the assembled motor with new timing chain pieces installed:
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