I had the same problem changed the oil seal and a car mechanic had done it before me and it leaked with him too and it did with me, bloody thing and the follow year made the alternator belt come off and rap it's self around the timing casing making the timing belt move, now a blood big job and bill, well pissed off.
Has anyone stopped this oil leak, if it starts! Yes I did put the oil seal in the right way and yes I did put oil on it before fitting and no mark on the crank to be seen to damage the oil seal and it was a proper Nissan oil seal.
Please advise, got another engine to fit, but would like to fix the old one too, if I can stop this oil seal from leaking!!!
What full.
Cheers
Citizen.