as i read in the threads to use Mobil 1 Synthetic oil in the tranny. I searched it in my country UAE and i got Original Mercedes Benz ATF only that costed my some $5.5 per liter. I drianed the tranny and the converter and added the new oil. Still i am not feeling good quality in shifts. even i rotated the vaccum modulator 5 clicks counter-clockwise, i still feel the hard shifts.

shams
150K 230E 1989