Penfolds G4 is a limited-edition Australian wine blend released in 2020 to celebrate the 175th anniversary of the Penfolds winery. The wine is made using a blend of four different vintages of Penfolds Grange, including the 2002, 2004, 2008, and 2016 vintages, hence the name "G4." The wine is aged in French oak barrels and is known for its rich, complex flavors and aromas of dark fruit, chocolate, and spice, with a long, smooth finish. Penfolds G4 is highly sought after by collectors and wine enthusiasts and is considered a rare and prestigious addition to any wine collection.