Jonny B Howdy to you too....and this is how I would set you straight:
You sound like you'll be taking some chances getting the proper fluid/s....This is the real deal:
1. When it comes to little things like oil/filter, the difference between dealer price and auto parts store's is not that much....needless to say the extra trip to exchange the wrong filter paid for that much of a difference in TIME/GAS!
2. What you reading as 80W is either for some manual or differential--75W-95W ranges. ATF= Automatic Transmission Fluids is red as you know it.
3. Visit your nearby BMW dealer, show them your VIN number, they will provide you with any data/specs for your particular year/model-for FREE.
4. While at it; don't forget to go through the waiting/show room and grab a cup of coffee--for free. Thus between the gas and the coffee I'll call it even.
Wishing you many good lucks with your car.