I wish to change the Differential Oil on 373 rear end of my 740 Turbo and got under there and see a few Un-Familiar things that I dont remember seeing on rear ends, I am used to american cars.

I see what looks like a Bolt that could be the fill hole at 8 O'Clock But seems a bit too low a point to be puting in 2 Quarts of Mobil One 75-90....? And to high a point to be the drain bolt....?

I am puzzled...........

Any quick Diagrams available?

 

well that was the easiest job yet..........
My 740 has the drain bolt at the bottom and the fill was at 8 O'clockish like I said...........It fit almost the whole 2 Quarts in it...

But the differential was nearly dry!..........It only had a half a Quart of Old oil in there......Scarry, hopefuly I cought it in time.....I had a gut feeling to change it, it was probably the original with 117,000 mile on it...

Now it has some Nice Fresh New Mobil-1 75w90 in it.

 

Good to hear...
Mine stillhas the original fluid in it (I think).
I have a new gasket in the garage and just waiting for a time to do it.