Yep, if you look at the back label it says meets JD303 specs and the newer ones as well so yes. I think its like 20 wt or 10w 20 viscosity or something, but that is not important as it meets the jd303 spec which is what we need.
That is where the o-ring belongs, on that shoulder a couple of inches in. It separates the sump from the small chamber holding filtered fluid - where the pump draws from.