~ I have reason to suspect an oil cooler gasket leak.(Blk SRT-170Kmi.) I have seen a gasket on parts sites described as upper. Some of the gaskets are oval and some look round in the pictures provided on those sites. I have also seen a "kit" containing three gaskets for around 25.00. The leak has spoiled my supercharger belt leaving it "sticky". I pressure washed the engine and the underside and cleaned the belly pan. Underside of the engine cover shows small particles of what I think to be disintegrating rubber from the belt.
~ Have any members here had to change these oil cooler gaskets in the past? Any caveats? I have not yet searched the PDF of common repairs by 100. Rob suggested to check all pulley bearings while I am in there as I believe they are all original.

 

you most likely just need to change the 2 smaller ones between the oil cooler and oil filter housing (4 bolts), the large one is for under the oil filter housing, if you need to go that far.
https://www.needswings.com/oil-cooler-gasket-set

 

I have had to change these same gaskets in my V8 and in an SRT6, recently. Both use the exact same gaskets, FWIW. Anyway, the V8's leak was from the big gasket under the filter housing. All three gaskets were hard as rocks. The SRT6 was plainly leaking at the cooler, but I went ahead and changed all three. Guess what? All three - hard as rocks. Also, getting the cooler off of the filter housing is a piece of cake, with the whole assembly out of the car. You will need a 48mm socket to get the filter housing out. That bolt will be pretty tight. I bought the 48mm socket (and a 1/2" -> 3/4" drive adapter) from Amazon for <$20. I changed all three gaskets on the SRT6 in under 30 minutes, including running all of the parts through the parts washer to clean it all up. Seeing how hard it would be to get that bottom rear bolt out of the cooler housing with the assembly on the engine, I'll never change just those two gaskets, but the whole set at once.

Rob @NeedsWings can get you all fixed up on the good gaskets.

 

Your going to want to replace all 3 as nemiro said. No point in only changing the 2 on the oil cooler. Also the easiest way is to remove the big 48 nut that holds down the oil filter housing. Then you can easily disconnect the coolant lines to the oil cooler and use a torx to remove the oil cooler from the oil filter housing.

 

im pretty confident it is a 46mm not a 48mm socket that is needed.

 

You are correct, my bad. 46mm socket!