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Originally Posted by t walgamuth
my mechanic and i have a theory that suggests that the rods are bending from failed head gaskets. it goes like this: the gasket fails, and leaks water or oil or both into the cylinder when the car is shut down, and if enough gets in the cylinder, specifically more than 1.6 cubic inches, upon startup the rod bends. the engine still runs but may have an occasional miss, and eventually will oval out the cylinder and cause excessive oil consumption.
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Now, this is the mechanic's theory, and not yours.
Ask the mechanic why
very few 603 engines with the 3.0 L engine suffer from bent rods, however, a good many 603 engines with the 3.5 L engine suffer from the same malady.
Do you believe that the head gasket is different on the larger engine; sufficiently so that it fails significantly more often?
Where is the evidence of coolant loss on these engines?
AFAIK, there is no coolant loss that goes in conjunction with a bent rod. Do you believe that coolant only leaks into the cylinder on shutdown and not during operation? Do you believe that the head gasket fails in such a manner to never allow coolant into the oil?
There is very little evidence to support this theory. I don't ascribe to it whatsoever.