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You can use any SAE certified automatic transmission fluid in your Mercedes Benz. You can check the transmission fluid with the transmission dipstick.
According to Standard Catalog of Chevrolet Trucks by John Gunnell, 1995, it depends on your VIN code. 5.7L TBIVIN Code A190 hp @ 4000 rpm300 lb.-ft. @ 2400 rpm Standard in Suburbans, 1 ton Vans, optional in C/K Trucks 5.7L TBIVIN Code K210 hp @ 3600 rpm300 lb.-ft. @ 2800 rpm Standard in Blazer, optional in Suburbans, Vans, and Pickups