Is it ok to add a different brand of BIA certified TC-W two cycle oil to a reservoir half full of Yamalube? I was looking through some notes I took in an outboard engine repair class years ago, and I had written down "don't mix oils". Too late. I just added a pint of Citgo TC-W two cycle to my engine's internal oil tank. Should I dump the whole thing and start over now? I know this question sounds dumb, but I don't want to make an expensive mistake.
