I noticed I have a running oil leak today. It drips pretty quick when the engine is running and doesn't when the motor is off. It's coming from the intake side of the block and I feel oil under the oil filter, but I can't quite see in there well enough to really, well, see. Is there a gasket behind the cooler that could be bad? It started after replacing one of the coolant hoses that go to it, and the problem persists with a new oil filter.