Daniel Ricciardo says he is doing the best with what he has as he lost a day of running following a late decision to go ahead and fit his fourth new Renault power unit of the 2015 season.

The Australian spent much of FP1 and FP2 in the garage, Red Bull having intended to get him out with an old engine and do limited running initially, before going ahead and fitting the fourth engine - the last of his allowance - through FP2. In all, Ricciardo managed just 13 laps all day.

Indeed, though Ricciardo says he wasn't expecting to get a lot of mileage done as Red Bull work to preserve the power unit for this and the next race at Monaco - where any penalty for a fifth engine would be felt more sharply -, he admits the late decision to make the switch cost him more time.

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"We didn't do much running. We expected to be limited with mileage. We had to put in the fourth engine for FP2, which I guess was on plan, but we knew we wouldn't do much today. The laps we did we still have a lot to learn.

"I think we tried to keep one in for all the day but that was optimistic so we expected the change to come, but we held on for a bit too long and that is why it delayed it [the engine change]. We have tried to save mileage on this engine, we realistically wouldn't have done much more this afternoon, so it was always going to be a limited day of running."

Though a change to a fourth engine was always on the cards following his spectacular blow out at the end of the Bahrain Grand Prix, Ricciardo admits it is unacceptable to have been forced into this situation.

"We all know it is not acceptable, but it is out of my control," he said. "I am doing what I can with what I have. The main thing is to get this going to the end of Monaco, that is the last place you want a penalty. Fingers crossed it will last two weekends and we will test everything after that."