[9] Having gained his first experience in a Ligier JS P320 prototype in July 2022, Oltramare entered the LMP3 category in 2023 by taking part in the Asian Le Mans Series.

[10] Once again at Cool Racing, he and teammates Marcos Siebert and Adrien Chila finished eighth in the drivers' standings, taking a podium on Yas Island to cap off the campaign.

[13] He was also originally supposed to join the team in the European Le Mans Series but was replaced by Alex García before the season opener.

[14][15] A strong result looked on the horizon at the first race in Barcelona, but Oltramare lost the lead he'd inherited during the pit stop phase to Gillian Henrion and later faded to sixth due to two spins, having struggled to keep his car's tyres alive.

[19] For the 2024 season, the Swiss would enter the ELMS with Cool Racing, partnering Manuel Espírito Santo and Miguel Cristóvão.