Hi all it’s been a while. I’m working on a 2015 6.0 on a K2500 truck. Replaced the oil cooler line gasket the one right above the oil filter. Didn’t see anything wrong w/ the sealing surfaces torqued bolts and it’s still leaking. Cleaned area w/brake clean and it’s definitely the gasket leaking. Is there a trick on sealing these leaks up? Thanks.