Scuderia Toro Rosso boss Franz Tost says he is satisfied with the performance of the team's Renault engine despite indifferent reliability seemingly putting it on the back foot during pre-season testing.

The only team to swap engine supplier in 2017 after renewing ties with Renault, technical niggles throughout the two four-day tests worked against Toro Rosso to ensure it only out-distanced McLaren-Honda in terms of mileage.

Despite this, both Toro Rosso and Red Bull have given positive feedback of the heavily re-designed V6 Hybrid power unit in terms of core power, with Tost saying he would rather it suffered gremlins initially but was ultimately quick.

"We are quite happy with the Renault engine," he said. "It's the new design and the engine shows a good performance, also from the drivability. Of course as it's a new engine there are some reliability topics which have to be sorted out, but I'm much more optimistic that this will be sorted out as it was a couple of years ago I think.

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"They are on the right way. Both drivers are quite happy with the engine. I don't see any major issue with Renault. We are very happy with them."

Even so, Tost says Toro Rosso won't be '100 per cent' come the Australian Grand Prix as there are still 'deficiencies' in the STR12 package.

"100 per cent will become difficult. On reliability I hope so otherwise we won't see the chequered flag. It must be our target for the performance side. After running and testing, you see some deficiencies and you are working on this.

"On the other side, there is a development programme going on on the aerodynamics, also from the mechanical side and this is a continuous process. This is so far everything within our programme."

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