As per the 2008 Sentra Owner's Manual, recommended engine oil should have an API Certification Mark and viscosity is SAE 5W-30.
According to Carcarekiosk.com, most Nissans have the oil type printed on the oil cap - it will likely be 5W-20, 5W-30, 5W-40, 10W-30 or 10W-40. If it isn't printed on the oil cap, check your owner’s manual for the exact type before adding new oil.
Whenever you are working under your Sentra, make sure to wear safety glasses. As you'll never know what could be dripping down from the engine, battery acid, engine coolant, brake fluid, etc.
All of these fluids are extremely harmful to your eyes and skin so it is important to protect yourself.
As the lubricant for the moving parts of your engine, oil is extremely important; it prevents excessive engine wear and tear and is vital for the continued functioning of your vehicle.
If you’ve ever stepped foot into your nearest auto parts store, you’ll have noticed the vast number of motor oil containers that line the shelves. Check out some tips on how to pick the right motor oil for your vehicle at Carcare.org.