AMSOIL Signature Series 10W-30 100% Synthetic Motor Oil (946ml./1quart)

Mitsubishi recommends using 5w30 or 10w30 for temperatures below 0 celsius. This oil is perfect for your car if you live in a cold climate and drive it in the winter. However, we have used that oil in the summer without any problems! It's just that good!
Your engine oil capacity is 4.5 liters, so you will need 5 of these per oil change.
 
 
Signature Series 10W-30 Synthetic Motor Oil
A New Level of Motor Oil Technology

 
Engineered for enthusiasts seeking maximum protection and performance. Precision-formulated with cutting-edge technology and a longstanding devotion to making the world’s best motor oil. The result: engine protection that blows the doors off the highest industry standards.
See the Product Data Bulletin for full details.
FIGHTS ENGINE WEAR
75 percent more engine protection against horsepower loss and wear1 than required by the industry standard, extending the life of vital components like pistons and cams.
Develops a strong fluid film that keeps metal surfaces separated.
Robust anti-wear additives further reduce wear in metal-to-metal contact regions for maximum engine life.
 
More info about the product here