1990 Nissan Maxima oil leak

First of all thank you so much for your donation.A lot of different thing's can leak oil.You need to see where it's dripping then follow the trail up from there.You could also get some oil dye and add that and find it that way.I would start by checking the valve cover gasket's and oil pan the rear main seal down by the oil pan where the transmission and engine meet.Also check around the front seal where the crank shaft pulley is.Let me know what you find.