Gear Oil, Greasing, Battery questions. HELP.

[maasa2002]

Hi Everyone

I used to have Toyota Land Cruiser. I sold it and bought a 2005 wagon, 4door, 4.5 gasoline engine, S, 9passenger, Manual transmission Nissan Patrol Y61.
The engine is TB45e
The transmission is FS5R50B
The axle (differential) is HG41
The VIN is (JNbBY11Y25X508XXX)

Here is a pic of the plate


I have some questions
1. About the greasing
Greasing points of the shaft are clear.
Almost as this pic


but the other points I couldn't find....

I mean, when I had the landcruiser the point were clear, this pic will show you


The question is, HOW to grease the front leather points??

2. About the gear oil. It's manual as I mentioned.
I didn't find SAE API GL-4 75W-90. I only found this




What I found is Mobil API GL-4 SAE 80W90. I found another single grade such GL-4 90, not multi-grade.
Some experts say it's OK, because of the weather he (hot temperature ) from 35-50 °C degrees during the Summer. In winter it's 20-40 °C.

My question is: Is it OK to use it?

3. About the battery. What is the perfect size of it? 70 AH or 65AH?

4. I bought a central locker. When the technical install it. He connect it to a one fuse from the cabin fuse box. He said it is the only way.
Here is a pic



5. The axle (differential) is HG41. What is the code of the differential? Is it Limited Slip?


That's ALL for NOW

Sorry.