Sequoia maintanance q's

[eclaixp]

Hi, I got a used 05 Sequoia 4x2 Limited and am ready to do some maintenance work to it. It currently has 69k miles. I am not too mechanically incline so just need some confirmation and answers:

1) Oil change: I am in Florida, is it OK to use Mobil 1 Full synthetic 5W-30 (6.5 Qts?) A mechanic advised 10W40 because of Florida's hot weather...
2) Rear Differential Oil: Is it Ok to use Mobil 1 Synthetic 75W-90W (around 4 Qts?) Also mechanic advised not to change it but until 100k miles...
3) Transmission oil: What brand/type/grade of synthetic oil should I use and how many Qts? How often should I change transmission oil? Any DIY instructions on how to perform this?
4) Anything else I should replace or maintain such as fuel filter, brake fluid and coolant flushing, etc?

I just changed the front and rear brakes pads with Hawk HPS pads and just ordered NJK Iridium IX spark plugs.

Thanks in advance for your help.

[mike552]

Congrats on the new truck.
My opinion is that a 10w40 would probably be too thick. That's right around diesel spec and certainly not the norm. I am not sure, but I am guessing that a higher viscosity will only create more pressure in the system, so unless you have very good reason to run a thicker oil I would certainly avoid it. I don't know about the rest of your questions, although I assume your owner's manual will answer many of them.

[big-o]

I would agree, just stick with the 5w-30, or even a 0w-30 oil for the motor. I did both differentials with Redline synthetic (all I could find in synthetic at the store I was in), as well as the transfer case just because I want it to last and it helped with fuel economy. The tranny also seems to like synthetic, and I think I just ran some Mobil1 and did a quick drain and fill every 30k miles (I think it's less than 4qts).