Moin Moin.. I bought me a bolted-out xj900 4BB today. Has everything been done so far. Only cardan oil not. I read in the book that a SAE 90 should be pure Have here still from my oldtimers a fresh 75w140 GL6 stand …should nevertheless also fold or? It will be warm yes thinner than a cold 90s In the differentials of various oldtimers has always come a GL5/6 with as large a tension as possible of viscosity. Cold as thin and hot halt thick…should nevertheless not snow ll run back enough into the lubricating area? I’ve done this for years and never had any problems. Or is the XJ very sensitive? In the engine belongs a 10w40. Does someone happen to have the norm ready? Or is there an oil among xj’lers or diva drivers where everyone “swear on it” . Best regards And always a hand wide under the bug spoiler. What I just remembered. These shock absorbers have come recently just before tuv at the previous owner. Do you need an ABE or registration for? I didn’t tell him and he wouldn’t have cared about it.