Hartzell HC-E4 3 Series Owner's Manual page 220

(7) If different grease types are accidentally mixed, the
propeller must be disassembled and cleaned in
accordance with the applicable overhaul/maintenance
manual within three months or 30 flights whichever
occurs first.
(a) EXCEPTION: Aeroshell 5 and Aeroshell 6 greases
both have a mineral oil base and the same
thickening agent; therefore, mixing of these two
greases is permitted in Hartzell propellers.
WARNING:
CAUTION 1:
CAUTION 2:
CAUTION 3:
MAINTENANCE PRACTICES
Propeller Owner's Manual
WHEN MIXING AEROSHELL 5 AND
AEROSHELL 6 GREASES, THE AIRCRAFT
MUST BE PLACARDED TO INDICATE
THAT FLIGHT IS PROHIBITED IF THE
OUTSIDE AIR TEMPERATURE IS LESS
THAN -40° F (-40° C). AEROSHELL 5
GREASE MUST BE INDICATED ON THE
LABEL.
IF A PNEUMATIC GREASE GUN IS USED,
EXTRA CARE MUST BE TAKEN TO AVOID
EXCESSIVE PRESSURE BUILDUP.
GREASE MUST BE APPLIED TO ALL
BLADES OF A PROPELLER ASSEMBLY AT
THE TIME OF LUBRICATION.
DO NOT ATTEMPT TO PUMP MORE THAN
1 FL. OZ. (30 ML) OF GREASE INTO THE
LUBRICATION FITTING. USING MORE
THAN 1 FL. OZ. (30 ML) OF GREASE
COULD RESULT IN OVER SERVICING
OF THE PROPELLER. VERIFY THE
OUTPUT OF THE GREASE GUN BEFORE
SERVICING THE PROPELLER.
147
61-00-47
Rev. 16 May/20
Page 6-10