If the engine can pull 5th gear and you won't take a fuel economy hit from using 5th gear, you won't hurt anything using 5th gear. The "don't tow in overdrive" is for light duty automatics in small cars.
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Originally Posted by ChazInMT
For tranny lube, only buy the factory stuff and don't believe anyone who says "Just use motor oil." They don't have to buy you're new tranny when the old one dies due to substituting. I researched this a lot for my own Civic and thats what I came to believe.
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Depends on the vehicle. For my Focus, the specified fluid says it's a premium 75w-90 gear oil, but people have had it analized and it's much more related to a 10w-40 motor oil than a gear oil. The performance builders all use Mobil 1 TDT 5w-40 or Rotella T6 5w-40 in them with great results.