Step 11; Select the best oil that money can buy (Royal Purple) if you're a real man that loves your car.
If you're a cheapskate that doesn't care about your car.... just use some other substandard oil found at Walmart..... You can grab it next time you pick up your monthly supply of Summer's Eve vaginal deodorant spray.
Yea.... I said it..... shots fired..... whatcha got? LOL
0W30 is the recommended weight. I intentionally went with 0W40 for the summertime to add a bit more protection during startup. Obviously not "required", just my personal preference.
(Mini-rant) I've witnessed (and smelled) what happened to Mobil1 after 20-minute long, grueling, highly abusive lap-battle track sessions. It was black and smelled like burning tires. I switched to Royal Purple in 2008 after seeing (and smelling) it under the same circumstances. Fresh, unburnt, and still purple. I've sworn by it ever since, and use it exclusively, even on commuters/daily drivers. It is ABSOLUTELY worth the extra money. (end rant)