Transmission fluid change on ZF 8HP - sealed for life?
BMW says the ZF 8HP transmission is "sealed for life" and doesnt need fluid changes. But ZF themselves recommend changing the fluid every 80,000 km.
Who do I believe? My F30 has 95,000 km and the transmission has never been serviced. Should I change the fluid now or leave it?
Ive heard that changing fluid on a high mileage transmission that was never serviced can actually cause problems. Is this true?
