Use royal purple...it is 12.00/L here in Canada but those of ya in the US can get it for less. High performance oil, gives you a bit more HP but more inportantly it runs the cleanest. I noticed a big difference when I changed it in my 09 HHR during its first oil change.

 

Somewhere some members posted not being able to get a full 5 Quarts in on an oil & filter change..

I've done mine twice & get a full 5 qts in & reads perfectly full on the hot dipstick.

What I do is pull the fill cap, then go under & remove the drain plug, come up & remove the filter... Go do something else for about an hour. (yes about an hour) That really gets a good drain done.
Then install drain plug, oil filter & it takes the Full 5 quarts & not overfull..

Yes I do put a clean cloth over the fill tube & oil filter housing, so no dirt or whatever could enter while I'm doing something else..

IIRC, ChevyMgr may have stated that GM says 1/2 hour for thorough draining of heated oil..