At around $25 for a 5-quart jug of Mobil1, it does seem a little backward to spend $25 on an oil analysis so you can determine whether or not you can save $25 by not buying oil.
And Qweesy, please come out of the 70's and join us here in 2012. Pennzoil conventional is of a completely different forumation than it was when it was causing sludge in your Pontiac Catalina, and Pennzoil synthetics are not even remotely related to their conventional oil in regard to forumation.
Mobil1 ceased to be 'the best' when they downgraded from group IV base stocks to group III. At best, they're now known for being marketing champs for selling highly-refined group III oils as 'true synthetics'.