hey mate, if you do a search there should be a fair few threads on this
I use, and alot of other people use Petrite HPR 15 or HPR 30. depending on how many k's etc
if its in good nic, not too many k's and no really bad oil leaks i'd go for the HPR15, otherwise the 30. i've used others in my ecotec and i wouldnt use anything else now
there is a long oil thread in the polls section .... but -
Stay away from cheap turd, use something between 15W50 and 20W60, and with a rating of SM/CF ( only the best )
Hmmm, not letting a new user search....that would be crazy if it was true.....although it seems that way when many new users post immediately with questions that have been answered before. Maybe if you type more info, then the search function will help you. Imagine typing just the word oil in other search engines like google. Can you imagine the results.
A quick 90 seconds of my life was taken up to type "engine oil" in the search engine. The results are below. Hopefully the search function is useful in the future for you .
Welcome to the site and hope you find out heaps of info. Be sure to have a look around in the threads as many many questions that you may have in the future may already have been answered also on this site.