Yup I'm sure your WS6 wont know the difference.I was trying to spice it up a little. It has been quiet around here lately. I won't tell you what is in the WS6 right now. Ok I will. 2 quarts of Mobil 1 10W-30, 2 quarts of Castrol Edge 10W-30 and 2 Quarts of Quaker State conventional 10W-30. The Quaker state was left over from the kids old 97 Silverado. That combination was what I had laying around after I changed out the stuck open injector.
I have a catch all 5 qt container where all the partial qts or partial 5qt containers are emptied into (20,30,40 and 50 grades with all sorts of W ratings 0,5,10,15,20). When the 5qt is full I use it for an OCI, out of precaution I only use in spring, summer and fall since I don't know what the final winter rating will be.
Clean oil is better than dirty oil or no oil.