No bio in the tank and I'm going to keep an eye on the Trans. As a matter of fact, I drained the original T fluid into a 5 gal clear drinking water jug and sealed it. I think I'll call my dealer and mention it to them. They seem pretty responsive to me when I'm over there for any service related items. I bought all the factory BX manuals. The strainer had a grey slime on it when I removed it for cleaning, not clogged, but a definite contaminate of some substance on it. Sorta like brake shoe dust suspended in oil. If that makes sense?