Lamborghini L539 / L545 (6.5 V12)

Lamborghini's 6.5 naturally aspirated V12 — the L539 in the Aventador and the L545 in the Revuelto.

⚑ It is one of the last naturally aspirated V12s in production, and that is the entire design brief: no turbochargers, 8,500 rpm, and a character its makers have repeatedly said they would not trade for boost. The L545 keeps it and adds electric motors rather than replacing it.

It is a clean-sheet engine rather than a development of the 1963 V12 it succeeded, which is worth stating because the two are frequently written about as one lineage.

Everything about servicing it is factory territory. Engine-out work is routine on these cars rather than exceptional, and no independent experience of any depth exists — the honest advice is that it is a main-dealer proposition.