[travelair]

Here's what happened:

42,000 miles: Titled car in my name and noticed coolant in oil.

45,000 miles: Used additive "liquid copper" in coolant advertised to stop head gasket leaks.

45,001 miles: Engine started knocking.

48,000 miles: Replaced lower intake manifold gasket.

65,000 miles: Crank failed.

Procrastination caused me to run the car too long with diluted oil. Then the additive poured through the leaking gasket and plugged oil passages causing further bearing damage.

All along, I thought the knocking sound was the lifters. Funny about hindsight.