LUBEGARD Highly Friction Modified (HFM) Automatic Transmission Supplement is a dual-purpose problem solver that corrects friction modification problems and enhances base ATFs to perform like highly friction modified OEM ATFs such as Chrysler ATF+4, Toyota WS, Honda DW-1, Nissan Matic ATFs, etc. Supplement your current ATF with HFM to prevent and eliminate torque converter lock-up shudder, soften and modify harsh shifts, and extend the life of the ATF LUBEGARD Highly Friction Modified (HFM) Automatic Transmission Supplement contains a concentrated additive package with additional friction modifiers that can be safely added to any ATF including full synthetic, semi-synthetic, and conventional fluids except Ford Type F ATF (1986 and prior), CVT and DCT.