I didn't add friction modifier because I've read elsewhere that you don't need to if you get the "limited slip" oil, but I'll try that. I don't know what it smells like either, but I guess I'll find out. :-) I'll also drive a little bit more to slosh the lube around a little bit. I've probably gone less than 30 miles since putting the new rear in, and it was thoroughly drained at the time.