Is it common (if the downpipe is semi close to this area) for these to warp and cause oil leaks? Because mine runs down from the front of my motor (pass side under the A-arm) and we replaced the gasket and it's still leaking. Should I just replace the whole thing? It might be warped enough where I can't see it, but enough to leak oil (about a cup if left running long enough). Only leaks when the car runs.