fluid analysis

2nd post here on the forum, so I'm a newb. I apologize for the ramble. I've been searching here and all over the inter-webs for a straight answer to this question. What is the best motor oil, transmission oil, and diff/trans case oil? I can classify the responses into the following...

Hi all, I am considering purchasing a 2010 LX 570 with almost 200k miles. It has been cared for meticulously by the PO except for the transmission. He towed with it quite frequently and I don't believe ever changed the fluid. He had it serviced at the dealer for everything, but since the...