Well, sort of.
The BMW M88/3 is an in line 6 cylinder (I6) piston engine. It was based on the M88/1 that was used in the BMW M1’s street version, with double overhead cam and four valves per cylinder. The M88/3 was used in the early BMW M635CSi and BMW M5 (E28) and produced 286 PS (210 kW/282 hp) (source).
Nice sense of scale to this shot, too. Note that the E28 is by no means a big car! What’s interesting is that despite looking every bit the tall, boxy saloon that it is (compared to the M1, anyway), the M5 doesn’t give an inch as far as sexiness goes— in our opinion, anyway. That shark nose with those quad headlights is just a deeply stirring look— we don’t think it’ll ever fail to impress.