What age does a tractor trailer have to be to enter California?

Tractor Trailers got to meet EPA requirements. Because California has so much pollution in the air. "DEF fluid" can get about 2,700 miles to a 25 gallon tank, that is what my 2011 Volvo is averaging. DEF Fluid helps your truck burn cleaner fuel, so you put out less pollution, so you can better reach California EPA requirements.