Hi Guys,

I want to bump up the oil content in a gallon of cool power from 17% to 18% for my new OS Max .91 Surpass engine. From the help I have already recieved that equates to about 1.5 oz's of oil to the 128 oz's of fuel. My question is I have some castor oil I purchased 4-5 maybe 6 years ago. I opened it and removed about 2 ounces all together back then. So the quart is almost full. I kept it it in my basement which is a finished basement and the temp is around 60 to 65 degrees all year round. It has never been opened since (5-6 yrs ago). Does it go bad ? Is it still good ? Is it OK to use an ounce and a half of it ?

Thanks in advance

Ed