I'm fairly certain the recommended fluid is ATF for '66 (and newer). There was a change sometime around '62 or '63 away from brake fluid to ATF. My '61 300G still uses brake fluid, so I've stuck with it, but when the system gets rebuilt, it'll get ATF. I owned a '66 Satellite convert back in '70 and it had ATF in it. Check your service manual for a recommendation.
Can anyone apprise me of the best oil to use in the hydraulic lift of the convertible top of my 1966 300? Should I purge the old oil? If so, what liquid should I use for purging?
Bell Canyon, cA