*Disclaimer: the engine mode rules are part of a technical directive, so we don’t have access to the exact wording/ruling for it* The manufacturer provides the same power unit hardware and engine modes, but the customer teams pretty much just use the more “standard” modes for a few reasons: 1) their individual cooling packages are almost never as good as the works team (though there was that time where Merc miscalculated the cooling requirements on the W09 which hurt them some on the engine side that year) 2) they are always going to be more conservative since they don’t have all of the same ingrained knowledge of the power units as a works team (there are actually engine manufacturer technicians deployed to the customer teams by the manufacturer). I do believe that they can choose to take an older spec as well. Like say Ferrari introduces their upgrade, and it needs X amount of cooling capacity. Haas might opt to take the old spec because they cannot achieve that capacity without significant aero loss or cost investment, or maybe they take the new one and just run it in a less powerful mode, etc. A lot of this depends on the weather and the circuit, too. Relating to the disclaimer above, I am not sure on exactly when they have to make any upgraded spec components available to the customer teams.