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20W-50 is fine for the engine, carb domes and tranny. The OD shares the tranny oil.
I recommend you use Mann brand oil filters, whether they say Mann or Volvo on them. They are exactly the same except for the markings. They're excellent. The engine and filter hold just over 4 quarts.
To fill the carbs, remove the air cleaners and the caps on the domes, which will come out with a plunger attached. Put in a small amount of oil, no nearly enough to fill it with the plunger out. Put plunger and cap back on, and lift the piston up all the way with your fingers. Any excess oil will squirt out the vent hole in the cap (have a rag handy). If none does, add more oil and repeat.
The thicker the oil, the richer the mix will be as you put the gas pedal down. This is what SUs do instead of having accelerator pumps. 20W-50 or 30W is about right. Lighter oil does not give better throttle response, which some people might try to tell you -- it's the other way around.
Check where the throttle shafts go through the carb bodies. This is themost common place where SUs wear out, in my experience. If you can rattle them around at all because the holes they go through have worn oval, the carbs need to be rebushed. This makes a night/day difference in performance, tunability, etc. That might be the cause of the roughness right there -- a B18B with nothing wrong with it is about the smoothest 4-cyl motor going, even at idle.
Drain the tranny from the lower of the two plugs on the right side of the case, and from the marked plug at the rear of the OD. Above the OD plug on the left is a plate held on with four bolts. Remove this after draining (and if you're very careful, you may actually not break the hard gasket behind it), and pull out the cylindrical wire mesh filter for cleaning.
After its all back together fill from the upper plug on the right of the case. Your local GenericAuto store will have a pump for oil bottles that makes this easy (inexpensive).
Oil capacity is 1.6 quarts, and you won't be able to get in quite all of it. Replace the plug and drive 5-10 miles. This will get the OD passages filled up, and then you'll have room in the gearbox for the rest. It's a pain, but if the tranny and OD are in good shape, you can go a long time without draining. Do check the level and top up at every oil change, but no need to drain and fill twice.
--Phil S.
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