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Thanks for your help. I contacted 2 dealer service departments and they assured me I could not buy just the plug. So, I removed the plug and replaced the o-ring with a 2-117 O-Ring. Seems to have fixed the problem. Again, thanks for the help.

I have a 2005 Denali XL and there is a small oil leak coming from the plug on the oil cooler (I think the o-ring needs replaced). It is located just above the oil filter. I have a couple questions. Can I loosen the plug with a wrench and get it all the way out with my fingers without causing...