I've been doing a lot of research on a oil forum BITOG.com and I've come to the conclusion that just about every synthetic 0w20 is pretty good for our cars. If your looking to save money look for the one that is the best price. Mobil 1 is highly rated as a great oil and very cheap! If your a extremest such as me and want to know what is the best, well your options are Royal Purple, AMSoil, Eneos Sustina, Motul.
I personally think Eneos is a great oil, but locally it is $36 with tax for 4 quarts. For me that puts it at $9 a quart which is too close to their top tier oil sustina. I'll break down the price chart using walmart for basic brands and cheapest online prices for the exotic hyped up oils.
(these prices are before tax)
All of these oils are 0w20
$4.40 Quaker State Ultimate Durability synthetic 5qts $22 walmart
$4.80 Mobil 1 synthetic advanced mpg technology 5qts $24 walmart
$4.60 Valvoline SynPower Full Synthetic 5qts $23 walmart
$5.00 Pennzoil Platinum Full Synthetic 5qts $25.17 walmart (rated high on BITOG)
$5.34 Castrol Edge Syntec Full Synthetic 5qts $26.88 walmart
$5.74 Mobil 1 Extended Performance 5qts $28.68 walmart
$6.70 Toyota Full synthetic (made by eneos) $83 shipped ebay 12 qts
$7.04 Penzoil Ultra Platinum (rated very high on BITOG.com) $105.60 amazon 15 qts
$7.09 Eneos full synthetic $28.35 4qts at napa
$7.56 Royal Purple 5qts $37.80 walmart
These are the exotic oils
$10 Eneos full synthetic 5qts $40 amazon shipped
$13.60 Eneos Sustina 6qts $82 shipped http://www.sparktecmotorsports.com/eneos-3220-302.html
$13.14/$11.77 redline 1qt $13.14/12qts $141.19 amazon shipped
$15 AMSOIL 6 qts @$90 shipped ebay
$10.63 prt liter liqui moly 4L $42.50 ebay shipped
Motul only sold in 1L bottles (1.05 qts)
$12.40 per liter 8100 ecolite 5L $62 ebay shipped
I'll be trying the most expensive oil I have listed on here after reading about it and watching Eneo's sales pitch. We will see how clean the oil looks after 7K vs the Castrol Edge Synthetic after 5k (that's getting a black stone oil analysis)
Like I mentioned before, the Mirage is a affordable car for people on a budget, saving money on oil is a good way to keep the prices low. I justify the most expensive oil 13.60 X 3=40.80+$10 M1-110 filter (amazon $35 or more=free shipping) =50.80 for a oil change. The dealership charges $56.00 for the castrol edge synthetic and a mitsubishi junk filter.