No adaptor problems at all, I although used the adaptor from the sandwich plate that was there, so not sure if any of the 4 adaptors that was sent with the plate where the same as the one there, had a nice tight seal between engine block and adaptor and then to the sandwich plate for the oil cooler to the filter. it did need some cleaning up though, with the teflon tape it's not leaking anyway and feels solid once there. I'm probably going to redo the whole thing there once I get my head around how to get the feed and return pipe for the oil cooler not to hit the redistribution for the oil to the turbos and the pressure sensor.