I believe I posted something on this when it occurred but a few years ago my crank snapped behind where the pulley attaches to it. When this occurred a few weeks earlier I used that Valvoline MaxLife when I changed the oil. After that happened and I put my "new" motor in i vowed never to use it again.
Now my last oil change I recanted and put the stuff in, normally I use DuraBlend, since my motor is getting old and I use it in my wifes car. Now I'm concerned that the crank is going to snap again. I know it was just a coincidence but if it would happen again i would snap. Now I need some honest opinions. Could the oil have caused the crank to fail the first time?

 

if it busts again.


get a 5.0

 

No

 

Agreed. There is no way oil could cause the crank to fail, especially behind the pulley. I would check the tensioner arm. It's really hard to imagine a tight serpentine belt could snap a pulley off, but that's the only thing that seems logical in my head.

 

Only thing that comes to mind would be a messed up harmonic balancer.The truck could have been in a wreck or been taken off-road where something hit the balancer causing it to have a slight wobble , which over time caused a stress crack that eventually broke the crank.

 

The chances of you having another broken crank in your life time is one in a thousand.........or more.

 

lol no chance

 

go buy a lotto ticket and if you win buy a new truck and if you dont, dont worry about it

 

Thanks everyone. This popped in to my head and i couldn't get rid of it.