kohler 7000 26hp Napa SAE 30?

[1978elcamino]

A friend came by the other day and said "I found this in my garage if you want it" and gave me two quarts of what looks to be about 10-12 yr old Napa SAE 30 in the blue bottle.
My zero turn has a 26hp Kohler 7000 and gets an oil and filter change once a year with Rotella T3 15w40 but was thinking about using this free oil with the next OCI.
I'm in Florida if this makes any difference. Maybe use the two quarts for one oil change or possibly use one quart Rotella and one quart of SAE 30 for the next two OCI's? IDK, thoughts?

 

[Lockasiam]

why not

 

[JavierH19]

I'd use it. I don't know anyone who mows when its below 65 so monogrades are fine to use.

 

[fantastic]

I'd use the old oil as one change but that's entirely what you decide. Price is right!

 

[RoadDukie]

Use it. But, be sure to shake the heck out of the bottles before use. It's believed that the additives can fall out of suspension and be left sticking to the bottle bottoms when you pour out the oil.