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Later use
The original specification MCL35 was displayed at the 2022 Goodwood Festival of Speed. One MCL35M is now part of McLaren Racing CEO Zak Brown's personal collection.

The MCL35M continued to be used in 2022 for private tests as part of McLaren's Testing of Previous Cars program. FIA Formula 2 Championship driver and Red Bull Junior Team member Jehan Daruvala tested the car over two days at Silverstone Circuit prior to the British Grand Prix, completing 130 laps. A second test at Algarve International Circuit was held in July: IndyCar driver Colton Herta completed 162 laps over two days, and McLaren simulator driver Will Stevens tested for one. 2021 IndyCar Series champion Álex Palou and O'Ward tested the MCL35M at Circuit de Barcelona-Catalunya during September 2022, together completing a total of 267 laps. O'Ward and Palou again tested the car at the Red Bull Ring in October 2022, together completing 171 laps over two days. In November 2022, the car was used in a private two-day test at Circuit Paul Ricard for Oscar Piastri, who McLaren signed to replace Ricciardo in. Piastri had a second test in November at Circuit de Barcelona-Catalunya, completing 150 laps.

In February 2023, the MCL35M was again run over two days at Circuit de Barcelona-Catalunya for private tests with Norris and Piastri to prepare for the 2023 season. Norris and Piastri again tested the car in April 2023 in a two-day private test at Imola, but the purpose of the test was not made public. The car was again used for a three-day test at the Hungaroring in June 2023, driven by Piastri, Palou, and test and simulator driver Oliver Turvey. Mick Schumacher, who joined the team as a reserve driver for 2023, tested the car at Algarve International Circuit in July. World Endurance Champion Ryō Hirakawa and O'Ward drove the car in a private test at Circuit de Barcelona-Catalunya in October. At the same test, Brown drove his own MCL35M.