McLaren forging closer ties with Toyota as F1 rumours swirl
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McLaren forging closer ties with Toyota as F1 rumours swirl
https://www.motorsport.com/f1/news/mclaren-forging-closer-ties-with-toyota-as-f1-rumours-swirl/10526659/
https://www.motorsport.com/f1/news/mclaren-forging-closer-ties-with-toyota-as-f1-rumours-swirl/10526659/
It seems to me this might be just a data sharing program, as to what I learned from the WEC community on reddit. McLaren used to use Toyota's wind tunnel which I think is in Cologne. McLaren might not be using that wind tunnel anymore and in return they take Rio as a reserve driver to still have some data shared between the two manufacturers.
And the link also mentions what I said in my comment. I was lazy and did not read it. My bad