Re: oil ???
I've never understood why people fret so much over oil. Some engineers that get paid a lot more than I do and have a bunch of framed papers saying they went to school for this stuff figured these things out for us. And then put it in that amazing thing called an owners manual for us to read.
I have a Saturn Ion Redline. The manual recommends an oil meeting GM Spec 4718M. There are like 7 diffrent oils that meet that spec. All of which are 5w-30 weight oils. That's what I run and I just don't worry about it. It works and it lubes the engine.