Normally you can just put in the car in Google and get the engine size, Wiki also does have all the cars in the world each year and the engine size they come with, but if these still don't help, there should be a panel on the engine that tells you how much cc or how big the engine is. If it reads 1789cc its most likely a 1.8L which is pretty much what every sentra has. But the only other two options are 2.0L and 2.4L. I'm guessing that I would say that the Sentra GXE is a 2.0L because it was a higher model then th XE or the basic package.
Sae 10w-30
The 2009 Nissan Sentra has a 6-speed manual.
The 2012 Nissan Sentra has a 6-speed manual.
The 2014 Nissan Sentra has a 6-speed manual.
The 2003 Nissan Sentra has a 5-speed manual.
The 2006 Nissan Sentra has a 5-speed manual.
The 2002 Nissan Sentra has a 5-speed manual.
The 2004 Nissan Sentra has a 4-speed automatic.
The 2008 Nissan Sentra has a 6-speed manual.
The 2007 Nissan Sentra has a 6-speed manual.
The 2011 Nissan Sentra has a 6-speed manual.
The 2013 Nissan Sentra has a 6-speed manual.