Probably that valve cover gasket. Two streaks might mean it's leaking on both sides of the hump in the back of the valve cover, first place I'd look. Harbor Freight or similar sells a little mirror with LED lights on it that make seeing those things much easier.

John B.

'87 Raider 2.6 Turbo Auto, Under Construction
'95 Montero SR, 35x12.5/15 BFG M/T KM-2's, Rock sliders, Qtr panel chop, gas tank lift, 2" BL, Aisins, 5.29s
'95 Pajero Mini
'98 Montero Winter Ed.
'04 Cadillac XLR
'03 Kawasaki ZRX1200R
'60 Ford Falcon 4Dr