"DOT 4" can refer to any of the following enforcable standards:

DOT 4 - FMVSS 571.116 (essentially obsolete baseline) 1,800 cSt@-40C

DOT 4- SAE J 1704 (updated 2019) 1,500 cSt@-40C

DOT 4 - SAE J 1704 LV (established 2019) 750 cSt@-40C

DOT 4 - ISO 4925 ... Login to read more.