Posted to the Waveform Library on 9/11/2023

Both of these caps (GM & Ford) are installed on vehicles that require the newish ISO 4925 Class 6, or the new SAE J 1704 LV approval. FMVSS 116 DOT 4 allows viscosity up to 1,800 cSt. GMW 3356 and Ford WSS-M6C65-A2 are both 650 cSt maximum fluids!