I can find no specifications on a 1.8 L engine. Just drain the oil, and replace the filter with a new one. Pour in 3.5 quarts of the correct weight oil. Start the engine and let it run for 2 minutes. Shut down and wait 30 minutes. Check the oil level and then add as necessary to reach the full mark on the dipstick. You now know the capacity. Do not overfill.
The gas tank on the 2014 Mitsubishi Lancer holds 15.5 gal..
The gas tank on the 2008 Mitsubishi Lancer holds 15.3 gal..
The gas tank on the 2013 Mitsubishi Lancer holds 15.5 gal..
The gas tank on the 2004 Mitsubishi Lancer holds 13.2 gal..
The gas tank on the 2003 Mitsubishi Lancer holds 13.2 gal..
The gas tank on the 2010 Mitsubishi Lancer holds 15.5 gal..
The gas tank on the 2005 Mitsubishi Lancer holds 13.2 gal..
The gas tank on the 2012 Mitsubishi Lancer holds 15.5 gal..
The gas tank on the 2011 Mitsubishi Lancer holds 15.6 gal..
The gas tank on the 2006 Mitsubishi Lancer holds 13.2 gal..
The gas tank on the 2009 Mitsubishi Lancer holds 15.3 gal..
15.5 gal.