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Discussion Starter #1
My son's 2005 Cobalt 2.2 completely stock. He was driving home and noticed the oil light came on and pulled it over.

There is a very large hole in the oil pan. He doesn't remember hitting anything. He said it was running fine. No knocks, no smoke, etc and pulled it right over.

What are the chances that it is just an oil pan? What worries me is that there really is no other marks on the pan other than the hole.

http://imageshack.com/a/img203/2945/lz6g.jpg

 

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That's strange. I've never seen that before and I haven't heard of any other owners having a problem with that. I would imagine it would have to be hit or bottomed out for this to happened.

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That's not a impact hole...something grenade in the motor and blew down...

Take the pan off and you might see where the projectile came from, but there's definitely a motor repair in order there...probably threw a rod...
 

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I believe that is an impact hole. Casted aluminum oil pans are pretty strong but if you hit a rock or even a nice chunk of ice it will make a nice hole like you see. Replace the oil pan if he didn't run it to long with no oil he should be Okay.
 

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Discussion Starter #5
It is a little hard to tell in that picture but if you look up in the hole you can't see up to where the rods are, almost looks like its more oil pain above that hole. I would think if it is a rod you would be able to see right up into crank and rods.

I will get the pan off today and take a look. Rockauto.com has pans for $85 so that wouldn't be too bad if that is all it is.

Is there a fuse to pull to disable ignition? I don't have the owners manual handy. I'd like to crank it over a few times and listen for anything strange
 

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If your son said no knocks and no smoke, just change the pan and oil filter, add oil 4.7litres or 5 quarts whatever it equates to. Start her up if all's well it cost you $120 to find out. Still less than a shop would charge you just to look at it.
 

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If something from the inside blew out then there would be no oil pan fragments inside the pan because the impact would cause it to burst out. If he hit something there is a good chance there are fragments of the pan inside of it. But I'm no mechanic just a student. I would just do what they said and replace tbe pan and try it. I'm sure he would have noticed something more than a light if the engine blew

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