[BMWCSRegistry] Transmission Fluid

[Todd Pantezzi]

Gent's,
 
I need advice on checking and topping-off the transmission fluid in my E9.  Mine is a '73 3.0 cs but with a 5 speed conversion.  My mechanic - a known coupe guru with plenty of experience on my car - advised me today that my coupe should have a 17 mm socket on the passenger side of the transmission which, once removed, would allow me to check the fluid level.  He said that it would be a normal socket, but when I put my coupe on jackstands and got underneath for a peek I saw what looks like an inverted socket hole.  My mechanic said the type of opening (socket) dictates the type of gear oil that is required.  He recommended Mobil One 75W-90, but now I'm confused as to whether or not this is the correct gear oil for this transmission given that the opening is not a standard socket but instead an inverted socket (I'm sure there's a proper name for it - obviously I'm an amateur mechanic at best).
 
Please advise on 1) the correct fluid to use and 2) whether or not I need to go out and buy a special tool/socket to open and check the fluid.  If more info is needed from me I'm happy to oblige.
 
Thanks in advance.
 
Todd
tpantezzi at hotmail.com
 
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