Reply To: OIL CHANGE MERC 3.9

[billw]

Mercs prior to about 1976 had steel shafts. They have a strong tendency to rust, get pitted and rough, and destroy the oil seals, particularly the one under the water pump. If your lower unit is still operational, lucky you! Until such time as it can be repaired correctly, which is quite a feat, I would change the gear oil after every single use of the engine. Believe me; I have been doing this for a living for a longggggggg time.

Long live American manufacturing!