My VW dealership recently did an oil change for me and afterwards stated they used a regular grade 5w30. I thought this was strange as I normally use Castrol Syntec 5w40 for topping up between changes. I went home and checked my manual. It specifically states to use 5w40 for oil changes only and that 5w30 may be used for topping up in between. I called them back and they stated that specs had changed since the manual was put out??? Sounds like a lie to me, but any help would be appreciated.
One more thing is it ok to use 0w30 during the winter as the bottle states it exceeds VW 502.00 and provides optimal winter protection?