Hi all I'm New to this site not sure if this is the right section to post my first post .. any way I got 1998 nissan gloria with 130k miles for 1000$ in good shape I think it's fair deal .
and I hope you help me car have some problems u hope you can help me fixing it

​ The first is the rpm rise when I shift to neutral and the second problem is the transmission hard shift into from 2 to 3

To my knowledge my car have VQ30DE but it's RWD I have no idea what transmission is on my car does anyone know what transmission fit on VQ30DE RWD ? And ist jatco or aisin or other?

And I would appreciate if you tell me what's the correct oil viscosity for the engine in hot climate?
​​​​​I hope it's possible to use 10w40 I have 2 4 quart jugs

Thanks.