Bob, yes the 30W silicone oil is a good choice. When I replenished the supply that came with my FD pump, I used 30W and it certainly appeared to be of a similar viscosity.
you can use 20 or 30 weight silicone oil or a light silicone grease, I like the oil as it's easier to get into the intake to lube the internals, one or two drops is all that's needed but it keeps them pumping...