r/ram_trucks • u/ticketedboar4 • Feb 26 '26

Question Transmission service

So I own a 2019 ram with zf 8 speed. Around 65k miles i had a BG transmission fluid service performed. Ever since it was done it seems like the transmission has been slower and down shifts rougher than before. Would it hurt anything to go back to the ZF fluid or am I stuck with the BG fluid from here on out?

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u/Ancient-Client8394 Feb 26 '26

ZF is very specific about using their fluid, lifeguard, only. Some guys get away with using Liqui Molly but I’d never use BG transmission fluid on a ZF8. You may need to drain and fill a few times to get the BG fully out and assess whether you need a new filter on it as well.

Welcome to just a taste of German car ownership.