I will talk to Klotz on Monday to see what they say. I bought some new klotz same part # and doesent even look like the old oil did. I will post there responce.
I had read that 2 stroke oil had a safe shelf life of about 3yrs do to additives settling out. I have some yamalube thats 2-3yrs old and have noticed a few gal. jugs had a bit of clumpy oil in the bottom.
I had a small barrel of Amzoil that I bought a few years ago, over time I noticed that it was clumping on the bottom. Before I would use your Klotz I would at least do some serious mixing.