A customer just dropped off a toro zero turn riding mower for repair due to vandalism. A foreign substance was added to the gas tank making it run poorly. I pulled the dipstick and notices a near florescent green motor oil which I've never seen before I've always known oil to be either clearish brown or purple. Any idea if this is just some brand I've never heard of or some strange thing added to the engine to help ruin it. Btw it's not overfilled like it looks in the picture.