[projectRDM]

Ultra Grey or Ultra black is fine, black is high temp but you won't see a need for it anywhere except the oilpan. Grey is sensor safe, so you can use a dab of it on the CTS or other sensors/switches that thread into aluminum to seal them without the need for teflon tape. I use both for each purpose, then wait a day and go back with a razor to trim any excess off. Nothing looks worse than a gob of RTV hanging out between two parts.