Broncox,
It's in IL, the town of Steger or Crete. You can take I-294 (south) this will merge and turn into I-80(east), once on I-80 you will pass over a big rock quarry, stay in the right lane at this point, the next exit will be I-394 (south) Danville exit. Merge onto I-394 (south) Danville exit and the Shell Station will be the forth exit off of I-394, you will pass Glenwood Dyer Rd, Lincoln Hwy, Sauk Trail, and the next exit will be Steger rd. . There is a stop light at this intersection Steger rd., the Shell Station will be on the right hand side of I-394. There is also a Harley Davidson Dealer and McDonalds at this intersection on the south/east corner.
Map quest isn't showing the address for the Shell Station, but the address for the McDonald (which is right next door) is 1350 East Steger Rd, Crete,IL. 60417. You can't miss it once on I-394.