Did you use any high-temp sealant or silicone gasket maker on your new gasket? I've read other DIYs where they used a silicone gasket maker in addition to replacing the crummy seal since it is made of BUNA-N and is only rated to ~250 degrees F. VITON or some other high-temp gasket material would have been a better choice for BMW's reputation IMO. This is not a job I want to do twice.