Omc Mustang 441 oil question please

[Maddy]

Hi Guys Thanks for reading I am changing the engine oil and the oil in the drive chains on my Mustang 441. I can do the engine quantity no problem but can some one tell me please, What oil do i put in the wheel drive chains and how do i determine the level or what is the quantity in each side. Many thanks guys, I would be lost without you all Maddy

 

[Tazza]

If it's hydrostatic drive, generally any cheap and nasty engine oil weight oil will do the job, parts are not under any real stress that needs special oil.
Sadly, i don't know how to tell the level, some models have a fill plug, you fill till the oil reaches the height of this plug.