MT Helical Drive Washers Oil Leaks
If it is actually dripping it is not considered normal, MT and GE have at times been plagued with oil leaks on almost every machine they ever built, LOL.
That said if yours is dripping you can keep using it until the transmission eventually seizes, the biggest problem in the mean time is oil gets on the main drive belt [ and your floor ] and the belt gets sticky and will not always slip properly to allow a smooth acceleration into the spin cycle [ may cause the motor to trip out on the overload protector ]. If this happens you have to clean the oil off the pulleys and belt [ in many cases you have to replace the belt ].
I had a neighbor with a 1961 A900S years ago that was leaking oil badly and I showed him how to clean the oil off the pulleys and replace the main drive belt [ it will not affect the pump belts operation ] and they kept the washer going with 5 kids for nearly 10 years this way.
The transmission finely got stuck and when I sold them another used MT washer we pulled apart the old transmission and it was still in great shape so we were able to install a new top cover [ with agitator shaft ] lower O ring oil seal, oil and cover gasket and the transmission was as good as new. A MT washer transmission is not like your cars engine where if it is run with too little oil it will blow up, the only thing that will likely be damaged are the parts that already need replacing on an old transmission.
The biggest problem is getting a new or good used cover plate with agitator shaft as these are no longer available. Good news is MT used the same transmission cover till about 1990 so we harvest good used ones for these older washers from lightly used newer machines which are on the recycle pile around here every week.