The dealer should be able to answer. Convenient, since you have to go there to get the oil.. It is the MB-number that counts I think. Like 238.4 or 238.5
Not sure if they split them up in synthetic or not.. But I guess mineral works fine, since I belive synthetic PS-fluid not to be availiable in 1999 ! ??
1991 W140 400 SE - SOLD !!
1973 W115 200 -For sale as project.