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.
|Dybala and Icardi World Cup chances not over yet, says Sampaoli|
|Reed dumps Spieth out, Harman accounts for McIlroy|
|James: Colombia can´t get carried away with France win|
|Italy to wait on Verratti injury|
|Lopetegui happy with Spain showing against ´physically stronger´ Germany|
|Warriors rampant, Weir inspires Edinburgh|
|Messi has had hamstring injury for ´some time´|
|Forward-thinking Southgate makes case for England´s defence|
|McLeish to ring Scotland changes for Hungary clash|
|Rodrigo dedicates Spain goal to Canizares after death of son|
|France were taught a lesson in aggression by Colombia, says Deschamps|
|Late Simmonds penalty breaks Bath hearts|
|Ronaldo up to third on all-time list after Portugal brace|
|Cowboys boost receiving corps with Allen Hurns signing|
|Tigers cling on to win Elland Road thriller, Saints respond at Hull KR|
|Meunier expects PSG will sack Emery|
|Tony Romo finishes last in PGA Tour debut|
|Germany friendly emotionally important for Brazil - Tite|
|France 2 Colombia 3: Quintero completes stunning comeback in Paris|
|Portugal 2 Egypt 1: Late Ronaldo double stuns Salah-inspired Pharaohs|
|No Messi, no Magic – Sampaoli playing a risky game ignoring Dybala|
|Netherlands 0 England 1: Lingard strikes to ruin Koeman´s debut|
|Scotland 0 Costa Rica 1: McLeish suffers defeat in first game back|
|Argentina 2 Italy 0: Banega & Lanzini win it for Messi-less Albiceleste|
|Germany 1 Spain 1: Muller wonderstrike cancels out Rodrigo opener|
|Curry available to make Warriors return against Hawks|
|Paire ousts out-of-sorts Djokovic in Miami|
|Ibrahimovic: If I want to go to the World Cup, I´m there|
|Michael Bennett indicted for allegedly injuring paraplegic woman|
|Svitolina ends Osaka winning run in Miami|
|Australia not ready for World Cup – Van Marwijk|
|Turkey 1 Republic of Ireland 0: Topal strike downs O´Neill´s men|
|Norway 4 Australia 1: Kamara hat-trick spoils Van Marwijk´s Socceroos bow|
|Aguero to miss Argentina friendlies|
|Monaco rubbish reports Rybolovlev will sell club and buy AC Milan|
|Harman sends McIlroy packing in Austin|
|Messi misses Argentina-Italy game|
|Neuer cautious over comeback date despite taking positive steps|
|Lehmann slams ´disgraceful´ Newlands abuse|
|Di Maria predicts ´big change´ at PSG after Champions League failure|
|Everton defender Holgate warned for alleged homophobic tweets|
|Russia 0 Brazil 3: Coutinho on target in routine win|
|Icardi must keep performing to earn Argentina recall, says Zanetti|
|Different place, same Zlatan - Ibrahimovic determined to maintain winning DNA with LA Galaxy|
|Injured Cavendish out of Commonwealth Games|
|Experience the key for Juventus in title race, insists Trezeguet|
|Stanikzai plays through the pain to guide Afghanistan to glory|
|Lyon and Paine frustrate Proteas after Morkel joins 300 club|
|Messi lacks Maradona´s charisma, claims Batistuta|
|Usain Bolt claims he´ll return to Dortmund|
|Trezeguet confident Pogba will shine at the World Cup|
|Ibrahimovic departs Europe with remarkable haul of league titles|
|´Very, very happy´ Lanzini loves West Ham amid transfer talk|
|LA Galaxy confirm Ibrahimovic arrival|
|Pressure off soaring Falcons, says Flood|
|Afghanistan edge out Ireland to secure World Cup spot|
|Age no barrier to Messi brilliance - Kluivert|
|Japan 1 Mali 1: Late Nakajima strike earns a draw|
|Record-breaking Stockdale named Six Nations´ top player|
|Warner in verbal altercation with fan following dismissal|
|Uruguay 2 Czech Republic 0: Suarez scores 50th international goal|
|I choose the Galaxy! - Ibrahimovic confirms LA switch|
|Retiring Morkel joins the 300 club|
|Parker accuses Joshua of disrespect towards NZ media|
|Roberto Carlos declares Neymar and Brazil the World Cup favourites|
|Kluivert tells son Justin to snub Manchester United for Barcelona|
|It´s hard to swing it when it´s not round - Anderson unhappy with pink ball|
|Reading appoint former Swansea boss Clement|
|I had to get out of my comfort zone - Goretzka explains Bayern switch|
|Isaako kicks Broncos to golden-point win over Tigers|