You'll have a hard time finding resources for a recent walmart schwinn. Honestly nobody cares when it was made. You might have better luck finding info on the components on the bike and dating it that way.
86 Samurai 1.3 leftovers
14 RAV4 2.5 5W-20 PP
16 Silverado 1500 4.3, DI, AFM 5W-30 PP
The most important thing to do in your life is to not interfere with someone else's life. - Frank Zappa