This SLS AMG roadster has been spotted testing
This test model is reportedly being used to benchmark a new engine destined for the C190
Reports have indicated that the engine being tested is a 4.0-litre twin-turbocharged V8
Exact power outputs for the new engine are unknown
The car was spotted alongside the camouflaged coupé
Initial reports suggested these test models showed a facelifted SLS
Rumours suggest the SLS will be phased out once the C190 arrives
The existing SLS AMG coupé has a top speed of 199mph
The current SLS is powered by a 6.2-litre V8 engine
The C190 is Mercedes' answer to the Porsche 911
The new engine is believed to be a twin-turbochared 4.0-litre V8, and could well see service in the C190 when it's launched at the end of next year. That model was recently caught testing in Europe.
This test mule was also spotted alongside a coupé version of the SLS.
The prototypes are both wearing camouflage around their front and rear bumpers, as well as on the bonnet of the Roadster. This is believed to be part of cooling tests for the new engine.
The C190 will be the successor to the SLS AMG and is mooted to have a price tag of between £80-£120,000.
Despite the new engine being tested in an SLS, it's expected that Mercedes won't replace the 591bhp 6.2-litre V8 engine which currently powers the coupé and roadster models of that car.
It is believed that following the C190's launch, Mercedes will gradually phase out the current SLS.
Prices for the current SLS start at £165,030 for coupe and £178,895 for the Roadster.