Shaeffers oil?

Shaeffers oil in 70 wt. wondering if anyone is or has run it? I have 55 gal. drum and while can run especially if mixinf 30 and 70 will give me a 50wt.LOL Yea not to sure how that really works out. If I don't sell it i will try mixing it down or run as is and just sacrifice fee hp in name of cash saved.

So if have run or are running thoughts?