mercury 99 4 stroke oil change

[TheIrishBean]

Hey I just bought a boat with a 99 Merc 4 stroke serial g833870 and need to change the oil because its been sitting in a garage for the last 2 years. what weight oil should i use? i know this is prolly and easy answer for someone and i don't have the owners manual so please help!!!

 

[DonHof]

I use Mercury 4 stroke oil and filter. I use 10-30 in my 30 hp.

 

[DonHof]

You did not say HP, looks like all take,
https://www.mercruiserparts.com/Sho...desc=4+Stroke+outboard+oil+-+including+Verado

 

[TheIrishBean]

Sorry it's a 25 hp bigfoot