No, its not a 500E. Another simple test: the 500E has the sports 4 seat interior as on the coupes; if it has normal rear seating, its not a 500E. Front lights and fenders, rear dif, 235ZR tires are other dead giveaways. If it looks like a normal 124E class its not a 500E. No-one would install an entire new M119 4liter long block, which would probably cost over $20k, into an otherwise OK 500E body, inlieu of a valve job or even a short block. Its cheaper to just change the badging.