Review on Fel-Pro BS 40666 Rear Engine Main Seal Set - Reliable Solution for Optimal Engine Performance by Derek Helvie

I received a black NOK stamp. The OEM (Subaru) is brown and NOK listed and has a long service life thanks to the Viton coating used. So I'm not sure if this is a rebranded Subaru seal, if Fel-Pro makes seals for Subaru, or neither. This installs just as easily as any OEM rear seal. Be sure to lubricate the inner seal before assembly and be careful not to bend the edges of the inner seal.