Oil seal isnt a fail mate unless its pissing out n the car cant be driven. As above flexi brake pipe or exhaust? If it brake pipe jus get a flexi off someone who is breaking to keep it cheap. If not then just a motorfactors will prob be the same one on any starlet. Like above make sure leak isnt sump. I use 10w40 mobil super 2000 quality and cheap. Everyone has their own preferance.