New Product In Stock – S11878 Synthetic Oil Filter (OE 12684038) October 2, 2020 / in New Products, Oil Filters, Spin-on Oil Filters, Synthetic Oil Filters The all-new ECOGARD® Synthetic+ S11878 is a must-stock spin-on oil filter designed for use when servicing popular 2020 heavy-duty GM diesel trucks. The S11878 is a direct replacement for OE part number 12684038.