The W140 chassis was the first car comming to the US with R134 & that was in Sept 1991. When the 400E/500E's came out they also had R134a. All 1993 cars EXCEPT the W201 chassis had R134a. BY law all cars from 1994 were R134a compliant.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
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44 years foreign automotive repair
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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