WHAT OIL IT NEEDS MY 2000 VW BEETLE 2.0 L WITH

I found 2 listings for the 2.0L engine, A and B. The 'A' had no info on oil type, the 'B' stated all temperature ranges require type 'SJ' and 5/30 or 5/40 weight. Because the mileage is 140k, I am wondering how often you must add oil between changes. If you add none, or under a quart, 5/30 is ok, if you must add oil more often, use the heavier weight, 5/40.