In my spouse's case? He doesn't have pre-ejaculate. At all. No fluids to speak of. Only about 3 times (married since 1991! Lived with him for about a year before that!) have I noted any oozing, and that tasted and looked identical to semen. Aside from that? Zip-all taste or fluid until ejaculation.

It wasn't a strong ooze -- it was more like... the last drippy bits after an ejaculation, sort of welling up a little, without any force behind them.

A couple of those times were when he had a stealth UTI, so I don't know what might've been up with the ducting.