I probably have 5-6 hours on my prop since replacing the motor. When we pulled to old motor apart what little grease that was inside looked like ear wax. The new motor lube looked about the same.
it's not the grease in the motor, it's the grease in the gears in front of the motor that's the problem.
steve
slyfox
model IV 1200-flying
912uls
IVO medium in-flight
RV7A-flying
IO-360
constant speed prop