Red Bull and Honda have targeted getting through the 2020 Formula 1 season without any unprescribed engine changes this season, amid growing optimism about the reliability of its power unit.

With its new RB16 performing well in the opening week of pre-season testing, Red Bull's hopes of battling for the championship will be boosted if it can avoid incurring grid penalties for using more than three power units.

Following a winter in which it has completed more dyno mileage than ever before, Honda F1 managing director Masashi Yamamoto told Autosport he has high hopes that everything is on target to get through the season without the need for a swap.

"That's our schedule and therefore we try to follow that allocation without penalty," Yamamoto said.

"We were quite competitive in the last half of last season and then the reliability was also very good, so we tried to continue that reliability with some more power.

"That was our focus."

Red Bull team principal Christian Horner said that although the current plan is to stick to three engines, he did not rule out taking a fourth if there was a clear performance benefit from doing so.

"We're not planning a fourth engine at the moment," he said.