What oil? Post Posted 21 June 2017, 11:51 PM #1573641 (In Topic #212074) marcsa3 Settled In Hi all. Can anybody suggest which oil to put in my cabby's roof hydraulic system?Cheers.. 1990 Golf GTI cabrio 1.8i. DX Engine 0 guests and 0 members have just viewed this: None. Forum home Helllllpppp!!