Originally Posted by Z K
Just go to any auto parts place and get the closest weight synthetic motor oil i.e. 15w50, 10w40. It is fine for topping off.
I had to do that when I was in the middle-of-nowhere on a Sunday. I ended up with Castrol Edge 10w40. I am sure it was fine, but I made the dealer do a complete flush and refill for free, when I got back home.