Where to download or buy a user manual for a nissan Elgrand E51?

Question edited for clarity

https://www.aaen.com.au/wp-content/uploads/2014/05/AutodataNissan4.pdf

https://www.youtube.com/watch?v=WN2go00ZsL0

https://www.google.com/search?q=2006+elgrand+e51+window+relay+location

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Window Relay

https://www.carfusebox.com/nissan-elgrand-2001-under-the-dash-fuse-box-block-circuit-breaker-diagram/

Your manual

https://manualzz.com/doc/27582718/nissan-elgrand-e51

It seems to be a very obscure model

https://www.google.com/search?q=2004+elgrand+fuse+box+diagram

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https://www.google.com/search?q=where+is+the+fuse+or+fuse+board+for+nissan+elgrand+e51+please&tbm=isch&source=univ&hl=en&sa=X&ved=2ahUKEwi9hvujqN3oAhVOzRoKHZ0dAMAQsAR6BAgGEAE&biw=1205&bih=570

https://www.youtube.com/watch?v=WN2go00ZsL0

https://www.flickr.com/photos/bitchinrock/albums/72157649233266609/

Should be 4.3 liters completely empty. I would add 3 liters and check the oil level, then add another liter if required by the dipstick. Once at about 4 liters, run the engine and recheck the oil level. Add more if needed.

Should hold 4.3 liters if dry. With an oil change and filter replacement, I would add 3 liters, check the oil level and add the 4th if it will fit based on the dip stick measurement. Then run the engine, check for leaks and stop the engine to check the oil level again. Add oil to the appropriate level on the dip stick.

Usually, the engine and chassis number of nissan car can be seen in engine bay. Like a credit card size and all info of the car are casted on the shiny metal. Location in engine bay usually placed on a clear portion of a chassis. Sometimes it is located at driver side wall when you open the door. Other are located under the front passenger seat.

https://www.manualslib.com/

http://www.manualsonline.com/

Search ebay.com

Example of seat for sale, may not be the same:

https://www.ebay.com.au/itm/NISSAN-ELGRAND-E51-REAR-3RD-ROW-SEATS-HIGHWAY-STAR/132258541358?hash=item1ecb392f2e:g:3~oAAOSwEH9ZZgIw


NISSAN ELGRAND E51 REAR 3RD ROW SEATS HIGHWAY STAR eBay

91 octane is good
there is one that is higher(95) but it is more expensive for little extra return
just don't use e-mix fuel

My personal suggestion would be to go for these repair catalogs. I know this website www.reliable-store.com that i used to get manuals from, and they have all models online.
I also brought for my 1989 BMW, such old model, they had it and it was very good manual. Go ahead, I bet.