McLaren racing director Eric Boullier has calmed fears over the team's early performances in testing ahead of the new Formula One season.
During Tuesday's session in Barcelona, Stoffel Vandoorne completed just 38 laps amid a trio of mechanical failures and the picture was not much brighter 24 hours later.
Fernando Alonso suffered additional problems, although he did complete 57 circuits, before stopping two hours in due to what was identified as an oil leak.
Having struggled badly with Honda engines, accruing just 30 constructors' points last season, McLaren have switched to Renault for 2018.
Alonso did get back out for the final few minutes of testing on Wednesday and Boullier believes McLaren's early teething problems are to be expected.
"It's just testing," he said. "On the tyres, if you look at the lap time, Red Bull did a test this morning, [they] put on new mediums [and then] new softs.
"They are half a second faster only, so there is not much difference because of the tarmac specification and the temperature as well. We have a technical reason why we want to work on the car with these [hypersoft] tyres.
"[Regarding] the car breaking down, it's testing so we have some little issues which we have to fix, but it's just testing. It's part of the process. We are on top of this.
"It's a new partnership with Renault, completely new packaging for the car as well. This is testing. Give us time and it's fine."
Meanwhile, Red Bull and Mercedes continued to impress - Daniel Ricciardo setting an unofficial track record on hypersoft tyres, 0.353 seconds faster than defending champion Lewis Hamilton, who was running on ultrasofts.
|French Open prize money up to €2.2m for singles champions|
|WATCH: Messi scores superb solo strike in Argentina training|
|Zimbabwe´s World Cup hopes all but over after UAE loss|
|Koeman names Van Dijk new Netherlands captain|
|Dybala and Icardi´s World Cup hopes doused by Sampaoli|
|Pierre-Paul joins revamped Bucs pass rush in trade|
|I almost s*** myself - Pique on Keane rant|
|UEFA order PSG to close Auteuil stand|
|Cummins puts Australia in control as South Africa collapse after tea|
|Surgery on both elbows for ´different animal´ Parker|
|Director of rugby Kennedy leaves London Irish|
|Brilliant Bale basks in Wales record|
|Romo hits back-to-back birdies on PGA Tour debut|
|Neuer needs to play to make Germany´s World Cup squad – Low|
|All we can do is take it on the chin - Bayliss responds to Auckland humiliation|
|China 0 Wales 6: Record-breaking Bale leads demolition job in perfect start for Giggs|
|Curry closer to return than Durant - Kerr|
|Alonso expects McLaren to be at ´lowest level´ in Melbourne|
|Serena´s conqueror and a new tennis superstar - who is Naomi Osaka?|
|Bale becomes Wales´ record goalscorer with China hat-trick|
|Hamilton warns Ricciardo not to rock Red Bull boat|
|It could have been worse! England´s lowest Test totals|
|The ´reality for people with a brain´ is Manchester United are in transition, Mourinho claims|
|Black Caps seamer savours Boult from the blue|
|West Ham ban disruptive fans for life after Burnley chaos|
|Storm respond by beating Cowboys|
|Ten wickets in 79 minutes - a timeline of England´s Auckland horror show|
|England´s bleak winter sinks to new low|
|Iniesta hints at post-World Cup international retirement|
|All we do is talk s*** - Pique goads Madrid stars over WhatsApp|
|England like rabbits in the headlights - Bayliss|
|Euro 2016 humiliation helped England, claims Dele Alli|
|58 all out! Shambolic England overshadow Broad milestone|
|Iniesta confident of two more years in Barcelona starting XI|
|Kane probably the best striker in the world - Maguire|
|Broad strikes again – the Opta data behind the England bowler´s 400th wicket|
|Wenger told Wilshere he could leave Arsenal|
|An India hat-trick and THAT Ashes annihilation: Broad´s finest Test spells|
|Broad removes Latham to claim 400th Test wicket|
|If you play for Atletico, you must be committed – Koke responds to Griezmann speculation|
|LeBron´s historic night leads Cavs past Raptors, Howard tallies rare 30-30|
|Del Potro, Cilic loom for Haase and Herbert|
|Giggs: Bale will feature for Wales in China Cup|
|Serena releases statement after skipping media following Miami loss|
|England bowled out for 58 in 130-year Test low|
|Maradona: Messi doesn´t have to prove himself by winning World Cup|
|Cavs tally worst defensive half of season against Raptors|
|McIlroy, Johnson stunned on day one in Austin|
|Cristiano Ronaldo hasn´t asked to leave Real Madrid amid China links – Perez|
|Oakland Athletics allowing fans to pick price of tickets, all proceeds to charity|
|Ginobili: Spurs not expecting Kawhi Leonard to return this season|
|Trout, Angels brass confident Shohei Ohtani will be a star|
|Osaka wanted to impress Serena with stunning Miami Open win|
|Manchester United apply for professional women´s team|
|Bolt hopes fellow Jamaican breaks his world record|
|Bolt a fan of Ronaldo, but compares his talent to Messi´s|
|Outstanding Osaka knocks out Williams in Miami opener|
|Del Potro ´tired´ heading into Miami Open|
|Heynckes definitely leaving at end of season, claims Ze Roberto|
|Joshua tells Wilder to be ´realistic´ in negotiations|
|Shaw issue a distraction from Manchester United´s failures, says Neville|
|Hamsik withdraws from Slovakia squad|
|RFU backs Jones despite awful Six Nations|
|Hamilton eyes Melbourne pole record, 100 club for Vettel? - Australian GP in numbers|
|Griezmann backs Pogba to prove doubters wrong for France|
|Sanchez ´expected something better´ from Manchester United move|
|WATCH: Thomas conjures up great escape in Austin|
|Javi Martinez in the dark over Spain squad omission|
|Jones should have managed England workload - Flood|
|Giggs feeling the tension ahead of Wales debut|