its a v6 3.2 liter 3.2L MFI DOHC 6C!
The '97 E320 had the M104 inline 6 DOHC engine
The '98 E320 had the M112 V6 SOHC engine.
Both are 3.2L.
Need a bit more information than that. there is an I6 model with 217 hp and a V6 with 221hp...