What is the viscosity of the gear oil for a Yanmar SD20 saildrive leg?

[ianwoods]

Hi, Sluggish starting has led to the suggestion that I may need a different oil in the saildrive leg of my Yanmar 1GM10.
The filler cap states SAE90. Lighter oil may improve COLD starting. Anyone had this problem?

 

[jeremyshaw]

Re: What is the viscosity of the gear oil for a Yanmar SD20 saildrive

The manual states, for the LEG itself, which is what I think you asked:

"Use GL4 or GL5 in the API service and SAE90 or 80W-90 EXCEPT Model SD20x1GM10C - which may well be what you have. for that they say "use quality "cc" in the API service and SAE10W30".

I would be surprised if this was causing sluggish starting though - assuming you start in neutral like most people!