Oil Capacity in my A100

Haven't dealt with an A100 before but I've had other trucks/vans with the/6 and these have always been 6 qts with filter.
Put 5 in, run it a minute, shut off and check with the dipstick. You'll either be OK or still 1qt low.
And as far as oil weight I wouldn't go below 10w30 or 10w40 but because of problems some experience with oil pump drive gear going bad (which is driven off of the camshaft and the cam gear eats itself as well when this happens) I wouldn't go any heavier either.
15w40 is also not needed. I definitely wouldn't run straight weight either.
10w30 or 10w40 would be my go to.