just bought an 06 and had a mechanic check it over. need to pick up a SS prop (looking at tempest)...is the 26 or 27 right for that motor?

also, need to replace the lower unit earl...do i need to stick with the high dollar evinrude stuff?

final question, should i run the 50 or 100 oil in it? it appears the 100 is for colder climates? i live in TX so i dont worry about cold weather that much.

thanks.