What is the latest Mac OS X that I can run on my 2.33 GHZ Core 2 Duo Macbook Pro?

My MBP was running the fan almost constantly and otherwise acting odd so I decided to just refresh the installation from scratch. At that time I was running Lion 10.7.5. Before rebuilding everything with that version I want to make sure running Lion on this machine isn't contributing to my issue.
What is the latest Mac OS X that I can run on my 2.33 GHZ Core 2 Duo Macbook Pro?
I have every OS release since the original purchase so I can rebuild on the one that's most stable on this laptop.

You can run Mt. Lion if you so wish:
http://www.apple.com/osx/specs/
If you want the most efficient OS, I would suggest Snow Leopard.
However I suggest doing some investigation prior to installing a new OS.  First do a SMC reset:
http://support.apple.com/kb/ht3964
Also run an Apple Hardware Test.  Use the #2 disk on your original install disk.
If there is no improvement, post back.
Ciao.

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