There are two o-rings underneath the oil filter cooler canister(well actually in the little canister that the oil filter screws on to) I replaced both of these and my oil leak was immediately solved! Cost for both o rings was about $8.00. the hardest part of the change was getting the coolant lines free from the oil cooler housing. The dealership is where you can purchase these at and they showed me an "exploded view" of the oil cooler canister. It took about an hour and a half. About one hour was spent not wrecking the coolant lines as I removed them.
email me at
bwb1230@hotmail.com as how your repair progresses.