I really do appreciate the feedback guys. It helps, a lot.
There are two more thing I'd like advice on.
1) I'm thinking about investing in my own obd scanner.. This way I won't have to go looking for one when needed, and it'll be available to me at the time of sale.
2) I've searched a bit bit have not found a definitive answer as to how I can check for the "pink milkshake" without draining it completely. Is there a more simple answer?
1) Buy it if you think you need it. I wouldn't spend too much though, it's free at most auto part stores.
2) Look here...