Toto Wolff admits concern over Mercedes engines failing at Monza

Mercedes had some problems with their engines last time out in Spa and are still concerned that the same problems could reoccur at the Italian Grand Prix this weekend. Toto Wolff has said that they will need to run all the engines in FP1 to try and determine how they are performing. 

When asked if Mercedes' engine performance would be impacted in Monza Wolff said, "that is not yet totally clear. We will know more tomorrow when we have run them.  

"It's still an unknown, we need to run them in FP1," Wolff said to Autosport. 

Sergio Perez and Robert Kubica have been forced to stick with old engines. 

"We wouldn't be able to put the new ones together in time. It's a capacity problem. There were only six. Some spares, but not enough."

Lewis Hamilton is hopeful that his engine is reliable and powerful this weekend. 

"I've been really, really happy with our engine, we've taken great strides forward," Hamilton said. 

"We only have three engines, and they have to go a long way, and punch out a huge amount of power.

"So it's not always going to be perfect. I hope my engine's good - we hope my engine's good."