Unlike the MG, the 15/50 engine had only a single SU carburettor so the power output was slightly less at 55 bhp (41 kW) at 4400 rpm.. Unlike the 4/44, the 15/50 had a floor gear change. From 1956 a "Manumatic" two pedal (centrifugal clutch) transmission was an option. This was controlled by a micro switch hidden in the gear lever operating a vacuum servo. Having no synchromesh on bottom gear could make changes into the lowest ratio, which would normally require double declutching, difficult.
The construction was monocoque with independent suspension at the front by coil springs and a live rear axle with semi elliptic leaf springs. The steering was rack and pinion and Lockheed brakes were fitted with 9 in (230 mm) drums all round.
In keeping with the up-market positioning of the Wolseley brand the car had upmarket trim with polished walnut dashboard and door cappings and leather seats and a traditional Wolseley radiator grille with illuminated badge. The individual front seats were placed very closely together to allow the car to be used as a six seater albeit marginal but it was usually sold as a four seater. The handbrake lever was under the dash. A heater was fitted as standard.
An example with Manumatic transmission tested by the British The Motor magazine in 1957 had a top speed of 77.9 mph (125.4 km/h) and could accelerate from 0-60 mph (97 km/h) in 26.7 seconds. A fuel consumption of 28.7 miles per imperial gallon (9.84 L/100 km; 23.9 mpg-US) was recorded. The test car cost £1011 including taxes of £338.