I was just working under the hood of my car, and I noticed that between the front rotor housing and intermediate housing that there was some sort of high temp sealant. I was just wondering if Mazda used any specific color of sealant on the factory engines, If any at all. I suspect that the motor that is in my car currently may be a rebuild. All the other factory motors that I have seen in other peoples cars did not have any visable signs of this sealant, so I was just wondering if this could be a sign of a rebuilt motor. I know that this is kind of a vague question, but i used to be able to look at a Honda motor and tell you if it had been rebuilt solely on the color and placement of the sealant used.

thanks.