Vic Smith wrote:
Can cause hydrolock, bent rods, warped heads, wiped bearings, etc.
Some catch it in the early stages and only pay $400-1200 to get it
fixed.
I've spent some time in Pontiac, Buick and Chevy forums reading
about the pain and expense this poor design has caused.

This is why GM is doomed. Not only would I never buy another one, but
when I see one on the highway I look to see what the fool who bought one
looks like.